[Drifloon]

Originally Posted by Funyarinpa

For example why the crime only occurs if Battler returns on that specific year. To be honest, I don't really know why it does in general. Yes, Yasu went through a lot of suffering because of young Battler, but would she really kill the entire family + servants because of that?

This is a common question; the issue here is that EP7 does not, on its own, provide a complete and full view of Yasu's character. It's by far the clearest and most extensive resource we have to learn about her, but it's mostly only her relationship to Battler that's covered; her relationships to George, Jessica, and even Maria are just as important, and they're easy to overlook or underestimate the importance of given the immediate massive infodump. Remember that two very important years of her life were missed out; you're going to have to piece those together yourself based on the previous episodes. Yasu's motivations are extremely complicated, and really require a broad look across the whole series to understand fully. And of course, there's no guarantee that she even is the culprit, or ever intended to kill anyone outside of her fictional gameboards.

By the way, isn't Shannon = Kanon (=Yasu=Claire=Businesstrice=Lion) pretty much confirmed in this episode? Why do some people still don't believe it, did I miss anything?

Pretty much everyone does believe it. There's just a vocal (well, not so much any more) minority who watched a certain nine-hour theory video and became convinced that Shkanon was a lie based on one guy's intelligent-sounding ramblings and their own vague memories of a series they probably hadn't read for months or years at the time they watched the video. EP7 really isn't ambiguous about this at all, and pretty much everyone who's really committed to understanding Umineko agrees on this point.

Also, the first teaparty... How are we supposed to know what's inside the catbox, or in other words if Rudolf and Kyrie really are this heartless. That would kinda suck, I loved Kyrie until that scene... But then again, just like she said, the others probably would have acted the same way. And aren't the guns they are using shotguns? How come Kyrie can use them with just one hand? Wouldn't the recoil dislocate her shoulder or something?

You may want to read EP8 before you come to any conclusions on this, but it's really up to you whether you believe Bernkastel's show or not. It depends whether you have enough love for Rudolf and Kyrie to truly believe that they're incapable of doing something like that. On the guns...rule of cool, I guess? I don't really know much about the physics of it.

Oh, and another thing... Lion, Shannon, Yasu... Do we know which sex he/she possesses? Her gender is probably female because all of her forms except Kanon are women, and even Kanon is always described as pretty feminine.
Speaking about Kanon, I am not sure if he is only a person in Shannons head or if she really dresses as him. I would've thought the former if Battler didn't speak to him several times during the games and referred to him as a male.

She was almost certainly raised as female outside of Lion's kakera, but you have to ask: if that's really all there is to it, why does Kanon exist at all? Take a look at this, as some food for thought.

As for Kanon's existence, the general consensus is that he only existed in Shannon's head up until 1984, at which point Yasu became the family head and was able to pull some strings to make Kanon's existence "real". Exactly how much she actually playacted him in real life is open to interpretation, but it certainly seems to have happened at least a little.

EDIT: Another thing, EP7 was the only one with a catbox mystery, right? The other ones have a single true solution to them?

I'm not sure what you mean here? The gameboards have a single true solution, yes. The real world, that we see in Ange's 1998 sections in EP4 and a few other places, is an eternal cat box. EP7 itself doesn't really have any mystery; it's an answer session for the previous mysteries. And the tea party is just a portrayal of a possible Rudolf/Kyrie culprit theory for the real world, not a mystery in itself. So I'm really not seeing how EP7 presents any particular mysteries that weren't already around in the previous games.