I don't know the exact time the Senior Day recognition will start, but it typically takes place after warmups and right before kickoff, so as long as you're there 15-20 minutes before the game starts, you should be in good shape.
By the definition the Outland Trophy uses, guards and tackles (offensive and defensive) are considered to be interior linemen while ends are not. It's outdated terminology, but that's still the way the Outland Trophy is defined.
I believe he did just walk on this year.
Had slotted that in my pre-written intro to add in Wisconsin's ranking once the rankings were released, accidentally put in Ohio State's ranking ahead. Thanks, it has been fixed.