My sources at the time he was shopping himself around were consistent on BB's insistence that he have complete control over personnel and direction of the football program. That alone was enough to turn off all NFL owners given that, despite widespread respect and admiration for his coaching prowess, there was the recognition that Belichick was far from perfect in several realms of the game.
His enabling of Hudson is an offshoot of that "whatever I say goes and I don't care what anyone thinks" attitude - which is only acceptable when he wins championships.
Of course, in college football, it's nearly ALL about recruiting - and while NC decided complete control was worth the gamble to attract talent with dreams of their draft prospects rising for having played for the legendary Bill Belichick - which combined with good coaching could be expected to result in great success.
At this point, with BB violating his own "don't cause distractions" mantra, one has to wonder if he's helping or hurting recruiting.
The current assessment of UNC seems to be that he's hurting recruiting, hence, despite the "whatever BB wants BB gets" contract, they're clearly taking steps to keep Hudson away from the program, which can't be going over well with Belichick.
I won't be shocked if Belichick never takes the field as coach. for UNC
Whether he knows it or not, BB is answering the question of whether he or Brady were most important to the Patriots' success.