Not sure where you guys are getting this idea that "All In" came from Chizik. It wasn't part of the team environment at ISU in 2007 or 2008.
It started in 2009 when Rhoads & Co. came to Ames. It's been a central part of the football program since then, and just recently (this season) made it's way into the public eye. Auburn embraced the same saying during the 2010 season.
Kinda like how Notre Dame football is synonymous with the "Play Like a Champion Today" sign, but most don't realize that Oklahoma's football program was the first to use that phrase and put it on a board for players to hit on their way out of the locker room.