Listen, there’s been a lot of speculation on the web as to why Katie Holmes might have left Tom Cruise.  I’ve decided to do some research of my own.  And by research, I mean I’ve put on a lab coat and trolled through gossip blogs.  I think it’s safe to say that my results are as possible as any of the others.   Here’s what I think might have happened:   He’s gay and the TomKat is out of the bag / closet.   Every time the doorbell rang, Tom jumped all over the couches hoping it was Oprah again.   Katie finally realized there is no science in Scientology.   Katie had the name Suri translated from its original sanskrit.  It means, “Mom,…