Sami was determined to drop weight, similar to Hero but Steen just doesn't seem all that bother. Brings it up in his shoot with Davey. If he did drop weight, I don't know why WWE would sign him anyway? He would of been good pre-PG are.
From what I've been hearing lately, post-Davey shoot (so, in The Kevin Steen Show with Michael Elgin and his second Art of Wrestling podcast episode), he's finally committed to getting into shape.
It would actually make Rollins look like a huge star and be the first guy to cash in at Wrestlemania. The only problem is execution. The best cash-in would be to have Rollins cash-in near the end of the match, where Lesnar is about to defeat Reigns, but then Rollins interferes and cashes in his contract which essentially turns the singles match into a triple threat. Rollins then pins Reigns for the win, it gets the title off Lesnar without hurting his monster image and give Reigns someone to feud against for the next few months.