Couple of points/thoughts on this.
#1. Like individual awards such as the MVP, they just aren't that important to me
#2. Does he belong based off on-field achievements, 100% of course he does.
#3. Is he an unlikeable ego-maniac that burnt a lot of bridges, undoubtedly.
#4. Was he less than courteous with the press and other voters throughout his career, again undoubtedly.
#5. Was he involved in cheating scandals, real or perceived during his coaching tenure, yes he was.
This is payback for all his years of being a huge ****.
Should his off-field short comings negate his historical record and coaching achievements, no, but I'm not surprised.
He will get in eventually, I see making him wait as payback, deserved or not.