Danny B is one of my favorites, but wouldn't that give the Sabres 4 of the exact type of center, all in different stages of their career?
Briere: former elite, smallish, non-phyisical center (plays tough but not considered a Defensive center). Offiensive center
Ennis: up and coming, smallish, non-phyisical center (decent 2 way game. still working at it. Injury history. Will take the body sometimes) Offensive center
Hodgson: average size, non-phyisical center (still learning to be a 2 way center. Tough sledding so far, but year with Top 6 minutes). Offensive center
Grigs: Great size, non-phyisical center (hasn't begun to develop any form of 2 way game at the NHL level). Offensive center
Personally, i like all of these guys, but this is what got the Sabres in trouble this year. I'm not expecting a cup contender next year, but it all starts in the middle. This team needs a solid two way center. I am hoping for Larson but that is a lot to throw on a kid in his first year, unless there is no expectation of winning.
You could move some of them to wing to accomodate all of them if they are on your roster, but is that the best move?