Kendall is not a clubhouse lawyer who has a history of undermining coaches. And before I get flamed, Mawae was a great Jet, and he is still among the better centers in the league, but the fact is that he was instrumental in driving Al Groh out of town, and I think Mangini was well aware of that.
Kendall can be a mentor too. He's been in the NFL for a long time and he's played center and guard. He'll be able to teach rookie o-linemen alot.