For The Day Beyond Hope, we're thinking a loop length of about 30 hours, like All You Need is Kill (well, we're discussing, we haven't confirmed 24 or 30 hours). So by the time Yui finds out she's pregnant the baby's already at least a few weeks down the road, and then there's the question of if she loops, will she bring her baby with her? Part of me thinks that a loop will cause a miscarriage, Yezar suggests that since the baby shares the mother's blood & body it should survive the loop, and AMT is just rubbing his hands at the prospect of dumping more suffering on Yui.
To an extent though, at some point we do need to stop, look and go, is all of this serving a point, or are we all just torturing Yui because it pleases us?
Another concept idea that was suggested was what if Masatada had found out about Yuuya and brought him back to Japan earlier when he was a lot younger. You'd then have both father and son trying to adapt to each other, and then some sibling drama when Yui comes along. Definitely Yuuya would follow his dad into the IRG.
IRG!Yuuya wouldn't necessarily be the object of Yui's romantic affections, though they would both love each other dearly and Yuuya would be a protective older brother, who takes heart what his father said about taking care of his younger sister. In the aftermath of Kyoto, IRG Yuuya would therefore be filled with guilt that he couldn't protect his jellimouto and thus the overprotectiveness goes up to 12. (Yeah, he had a good reason for not saving Yui, he was being badass in a Zuikaku with Ikaruga, but you try convincing him of that.
)
On one hand though, this kills a significant amount of drama in Episode 3-6, because Yuuya is already dialed into Japanese TSF doctrine. Although I think he'd still stall out in his Fubuki.
And make the same comparisons as Canon Yuuya did.
....but of all the ideas, I think I like expanding Finding-verse the best.