Almost every match had a swerve winner last year, I doubt this year will be any different, so yeah, it'll be the opposite of what everyone wants and/or expects. Common sense doesn't exist when predicting WM winners
Um, yes it does. Just assume instead of storylines, WWE is booking to make the casual fan watching happy or push somebody to those causal fans.
Thus, Jericho winning, Brock beating Ambrose, the legends beating up the guys in the 6-man, Zach Ryder pointlessly winning the I-C title, Shane O' Mac being in a big match, a Flair keeping the Women's title, and Roman being crowned. It's about showing off what Vince wants to show off to the guy who got Wrestlemania, but doesn't pay attention the rest of the year (ala Bill Simmons, before his kid got into the WWE.)
You have to stop thinking of WM as the Super Bowl when it's really the a combination of All-Star Game and Old Timer's Game.
The normal storylines will go back into effect on the RAW after WM.