How are you able to gauge the mental toughness of dozens of kids you don't even know? You're pulling that argument from a place where the sun doesn't shine.
Talent and depth, though, are a whole lot easier to objectively assess. For years we ranked at or near the bottom of the Big Ten in recruiting, and we lacked depth almost across the board. A compelling argument can be made that we were collapsing in the fourth quarter not because of a lack of mental toughness or effort but because our guys were in for too many snaps and were utterly gassed. Or, when a Number 1 went down to injury, the Number 2 was vastly inferior. Also, when you're fielding a team in the Big Ten with nothing but two and three stars, you're going up against guys every week who are exponentially better. If Vince Lombardi himself was resurrected and coached a MAC team, he wouldn't be able to beat Ohio State. He might be able to hang with them for a while, but the end result would always be the same.
I don't know what impact, if any, Tom Allen has had on the "mental toughness" of our current roster. I do know, though, that he's recruiting at a higher level than IU fans had ever before seen in the recruiting rankings era. That's not a claim I'm pulling out of my ass, and this fact gives many of us hope. Haters are gonna hate regardless, though.