@lamafist, you make a lot of good points, but I'm missing the central thesis. What is the conclusion that we're jumping to? That Mangini isn't necessarily a worse coach than BB?
While I certainly agree that their situations don't make for an apples-to-apples comparison there is as much evidence to compare Mangini and BB as there is to compare any other 2 coaches in the NFL.
I think it's as safe a bet as any that Mangini, under any circumstances, would be a worse coach than BB. I mean, I'm hardly impartial on this issue, but I think BB is one of the all time best coaches in NFL history, so I never really entertained the notion that any of his proteges would end up surpassing him.
No, the "central thesis" of my posts was that the conventional wisdom that Mangini has shown himself to be a lousy coach is based on specious reasoning, a lot of which could have been used to likewise condemn BB before the 2001 season.
In short:
a) There were a number of obvious factors regarding the actual players on the field that almost certainly had more to do with the defensive turnaround than Belichick taking over the signal calling.
b) The fact that BB wanted to keep Mangini at DC, to the point of trying to talk him out of the Jets HC job, in my mind mitigates any speculation about Mangini's abilities based on 2005.
c) The Jets' making the playoffs in Mangini's first season was actually really bad for him. Starting in his 2nd year, he and Tennenbaum had no choice but to make personnel moves with a "win now" mentality, rather than accept a potential fall-off while trying to slowly build a solid team for the long haul.
d) After this led to failure, as it usually does, Mangini seems determined to not make the same mistakes in Cleveland, and seems almost Belichickian in his willingness to piss off fans who want to see their team win a few games this season by trading away anybody not part of his long-term plan whom he can get any value for.
My conclusion from this is that I do not believe has demonstrated himself to be a bad coach yet. He hasn't demonstrated himself to be a good coach yet either, but it would be a mistake to overreact to the angry fans and not let him continue the rebuilding plan that he seems to be basing on Belichicks' first years in NE.