IMHO The b25 can't and shouldn't win for the same reason the a26 is unlikely to win... namely, we are up to our necks in twin engine medium attack/ bombers... who cares? why do we really need another one?
The HE111 was the only interesting bomber presented, and while I would like to see it, I know it will not make the cut.
I think the Yak would be an interesting addition, I think the 39 needs to packs its bags, because it has no place in the main.
The G55 didn't make it for the same reason you'll never see a french plane... Nobody likes a quitter. Italy dropped like a sack, and was never much of a story in the airwar (with the exception of a few battles)... You can't expect anyone to get behind that, no matter what the plane might have been.
The Buffalo was obsolete 12 months before the first shot was fired, it never had a prayer as a MA machine... I know the fin's love it, but no one else cares.
I like the 410 for personal reasons, I'm not certain its the best choice for the arena, but it is the one my money is on, and based on what I am seeing, I think it will be in the final round.
As an American, I'd like to tell all you U.S. bashers, that we are not so ego-centric that we can't tell when too many U.S. planes are already in the pool. I'm really hoping for the 410, the yak3 or the HE111 (although it'll only get used in events and will be a MA hanger queen).