Jason Collins is listed wearing 98 on the Celtics website...LOL
I know Dooling is still showing 51 but I think he changes it to 55.  Leaving 51 open for Melo.
Melo has already chosen #13
Not a lot of players choose #13 for superstition reasons.  But 2 I can think of: Wilt and Dan Marino.   Among the most dominant NBA players of all time and among the greatest passers in NFL history.  Unfortunately as luck would have it, they produced only 2 championships between them (both Wilt).  If Fab becomes the next Wilt, that will be nice  

.  When Fab fills out, they'll be pretty close to the same size.  Then there's that whole skill thing.