The mere fact that you continue the debate is ridiculous...it is no contest...Swanigan wins the award going away, and it has nothing to do with the fact that he plays for Purdue and I happen to be a Purdue fan...but everything to do with the fact that he has been the best and most dominant player in the conference, never mind the most consistent.
Happ plays on the team with the best record at this point, and they may ultimately have the best record at the end, but that has nothing to do with whether or not they are the genuine best team...Purdue thumped them in West Lafayette, and they would be just as likely to thump them again in Madison if the opportunity were there, and they may thump them again in the BTT.
Biggie is not a great defensive player and he turns the ball over too much...which makes the fact that he is still so dominant in other phases of the game that he is recognized as not just the best player in his conference, but one of the best five in the entire country all the more impressive given those shortcomings.
He is dominant...in every game...and has been for the course of the season.
A case could be made certainly that if anyone other than Caleb was going to win the award, that Happ could/should/would be the next choice...if that is your point, so be it...but he is not better than Swanigan, and he is not going to win the award over Swanigan, nor should he.