I'm not sold on BK being better than Urban.
Getting back to BI's question, however, I would ask BI which coaches in the SEC are undoubtedly better than BK? Saban, well, okay, give ya' that one. The other "name" coaches? Miles, Sumlin, Malzahn, Spurrier, Richt, Muschamp? All of them definitely better than BK? I believe that if you put BK at LSU, A&M, or Auburn, with the same players that are there now, he would do at least as well as the coaches that are there now. Put him at Georgia or South Carolina or Florida I think he'd do better than the guys that are there now.
ND has limitations in recruiting that those schools will never have.
Finding the kid who wants to spend a ton of time in the classroom/library/lab as well as on the football field, in a place where it's cold from November through early April, where the scenery is not the same as in the warm weather south, where there is no escaping the religious element, where there's no big-screen to watch yourself on in the stadium, and where the town is not so hot, well, that's hard to do. Hard to find that guy. Hard to make him want to play at ND. Winning can change some, but not all, of that, regardless of who the coach is. Heck, if winning was all that mattered, Alabama would be getting every 5 star on the planet.
Just my opinion.