I disagree on your last point. The shove to Moss was big...and illegal. It's what guys try to get away with all the time...but in that setting with a tear drop pass...that's a missed call and it was obvious. Moss was tracking the ball then all the sudden he was going the other way. Offensive pass interference.
Purdue followed the defensive game plan that has beaten Iowa forever. Rough up their receivers and try to get away with as much as you can...it works. Our receivers need to fight back. When they have to block a DB...they need to punish them...especially Smith. They need to be more physical getting out of their breaks and shove off too...until it's called.
I get the point, but, if you go back and watch the replay, it wasn't nearly as blatant if you watch it objectively. All good receivers use subtle little push offs. Generally, refs are not going to call it unless the arm extends quite a bit. It's on the DB to learn how to fight through that.
Think of it this way, if that was an Iowa receiver, and a push off was called, we'd all be complaining about it being a ticky-tacky call. Tavaun Smith did the exact same thing in the B1G championship and Iowa fans were railing on the MSU fans for complaining.
The TV announcers used the term egregious when the refs got together and waived the horsecollar flag.And even the TV announcers were stunned that it wasn't an offensive pass interference call. They mentioned it in real time and on every one of the replays. Yet..... no call.