Did Tsunade's diamond grow back? I recall it was supposed to disappear after she uses it and only come back after she stores power for a long period of time.

I guess it means she can use the instant regen skill again and possibly spread it out among all the kages.

Wonder who will be able to stop Madara. From what things look like, he is way above every one even all the strongest, including Naruto and Sasuke, combined unless the first is revived or Orochimaru pulls an edo-tensei counter out of his mouth.

Nowhere in this chapter did it show that. Long-haired Tobi was around during the Uchiha Massacre, which occurred well after the flashback events shown on the last page. Besides, Madara is shown on the last page to have gone grey/white in his old age. Are you saying he dyed his hair later on?

According to the timeline, Madara should already be dead by the time Obito's body is crushed by the boulder. This was concluded from the fact that Madara died shortly after attaining the Rinnegan. And we should all be able agree that Nagato did already have the Rinnegan when Obito "died".

So, to me, the last panel which shows old Madara with his eyes intact tending to a sewn-together Obito, cannot be taken at face value. The last page only seems to make sense if it takes place in a limbo world between life and death.

I don't see how Madara could still be alive at that point in time. If he were, you'd think he would have taken the time to raise Nagato himself (so that he would be more loyal), rather than leaving him in a war-torn country. Alternatively, if Madara were still alive, he could have given the Rinnegan to Obito rather than Nagato.

And why is that?

Maybe Madara know's Orochimaru's body swapping technique and used it before he died. Thus explaining why zombie Madara looks so much younger than old Madara...

Well I think the person who knows all, that Orochimaru spoke off is Madara so they are probably going to where Madara is...
But unless Orochimaru has a counter measure for a renegade edo-tensai(knowing him, he probably has) it will take a new person showing up to stand a chance against Madara...

Gray hair.
No that was Kabuto's doing, he explained that he managed to revive him into his prime.

That doesn't contradict the theory of Madara and Obito being Tobi, since the idea does not rule out the possibility of a third person being involved.

Ahh, must have missed that bit. Cheers.

Madara should be happy he was brought back by Kabuto with the Edo-Ten. Otherwise he would be all old and frail looking a bit like your avatar?

I just always want Oro to be involved for some reason. I was absolutely buzzing when he made his recent comeback.

This chapter makes Tobi = Obito looked cool,,

so is everyone still upset that Tobi is Obito??

the story is getting interesting I might say,,,

Another possibility is that the old Madara seen on the last page is not the real one, but a Zetsu clone that was left behind by the original for the purpose of guiding Yahiko into creating Akatsuki and training Obito over the period of a year or two. That would also solve the timeline issue.

Yes, Tsunade's Yin seal was clearly visible, I think that Tsunade will use the chakra left in the Yin seal to perform Sozo Saisei to heal the other kage and then use Katsuyu to reattach the lower half of her body and then proceed with healing, the only real drawback is the Creation Rebirth technique with effect her hayflick limit.

It removes Madara from all of Tobi's appearances including the ones from Bloody Mist era and prior to the Uchiha massacre. Without those two there is no need nor reason for a Madara impersonating Tobi and the only thing remaining is an Obito hidding his disfigured face in order to impersonate Madara (although his willingness to show off his face to Sasuke and Kisame is nonsensical but whatever I guess).
That was the first thing that came to mind to salvage the issue but if that was the case Edo-Madara wouldn't know Obito. He could only know at best that Zetsu was to seek a replacement but he couldn't know his name.

This is what I think,

WHen Kisame finds out that TObi is Obito,,,

I think Kisame knew their plan,,, that Obito is trying to be Madara,,

Kisame said that...

"I never knew that you were TObi, Mizukage,..... I mean, Madara"

when Kisame said " I mean Madara", I think he knew the plan,,, thats why he killed himself when the Intelligence are trying to get in his brain

You are correct about Tobi's showing during the nigt of the massacre. However, Madara's grey hair during the time of Obito's face crushing does not mean grey hair during the second great ninja war. So at that time it might very well have been Madara under the mask.

I don't recall a flashback featuring Tobi during the 2nd world war.

There's no need for that. We know this because Tobi said that he was the one who gave Nagato the Rinnegan, which happened at that time.

I'm not sure I follow your reasoning, everything Obito said on the subject was while impersonating Madara (even when it made no sense to do so). The fact(?) that Madara gave his eyes to Nagato doesn't imply that he was disguised as Tobi back then.

Tsunade is getting ready to do a Heroic Sacrifice. She likely won't have enough to heal herself after the others. She'll save the other Kages at the cost of her own life. I honestly thought Onoki would be the one to go. But I guess after he acknowledged Naruto, he was safe.

Now we know why Kishi had Dan go to her one last time.

So obito was rescued by some old dude. Old dude is not necessarily Madara though. Why couldn't he be Madara's brother Izuna?

Its true that the old dude has eyes, and Izuna lost his. But eyes can be transplanted without much difficulty in the narutoverse. Its plausible that Tobi and Izuna are linked somehow, especially since Tobi is such an eye collector. Maybe that's Izuna's collection of eyes from over the years, that Tobi inherited.

So maybe Obito was Izuna's protege, or maybe there's even some kind of personality merger there. He certainly seems to be on familiar terms with Madara.

Oh nevermind, I thought I'd remember Tobi helping out Hanzo during the war, but I just checked and it was Danzou, not Tobi. Don't know why I have this image in my head.

But aside from that, the only justification I can see for Obito to imitate Madara would be that they both were Tobi. Obito does not have the right to speak for Madara, Tobi does. This is just assumption, though, and it is not even relevant to the story when Tobi doesn't appear that early in the timeline, as you rightfully pointed out.