@Ravi2000 That is the likely outcome, based on the normal standard of first girl wins, so you should end up happy. However, I think that just pairing "best boy" and "best girl" together without considering "fit" might be a good approach, but also might not be the best approach. I agree with you that they are the "best boy" and "best girl" (and I don't think it is close), but think about how amazing the antics would be of Usagi and White Crow LARPing together all over the place would be. I would totally read a spin-off manga of their life as adults, still going around dressing up as an assassin and Bunny Soldier(?) and playing all over the place. A collaboration stream by them would also be pretty awesome.
I also think that Takane fits better with Yuu, in that they can each help each other come out of their shell more, at a pace comfortable for both of them. They also are very considerate of other people's feelings, and are very supportive (though, obviously, Viina also fits in that category really well).
For those trying to defend Souta as "just trying to make sure Jimi isn't hurt", you seem to have serious short-term memory issues. He was acting that way before he started being more interested in her, when he still saw her as troublesome. The reason he is terrible is that he assumes the worst in everybody, then tries to trip them up any way that he can, to "prove" how terrible they are. We can see that, because Yuu tries to be nice and friendly, he has become more suspicious, even though he is just trying to genuinely be friends with people. If you are looking for one mistake to write somebody off, it is easy to find one, or to interpret something that is actually innocent as nefarious, and thus right them off without ever really giving them a chance.
Almost everybody else in the dorm is willing to think well of their housemates until proven otherwise, whereas Souta thinks ill of his housemates unless he gets overwhelming evidence to the contrary, and even then, he would be willing to assume the worst of them again for one mistake. That is why he is the worst.