What about Brevin Knight?
No interest in a backup point guard that can't shoot. That would mean that the Celtics have no reserve players (Daniels, TA, backup PG + Giddens, Walker) on the perimeter who can shoot the ball and no shooting from the starting point (Rondo).
Only shooters would be the Big Three and Sheed. I don't like that idea. You want guys who can space the floor for them, give them room to operate, and punish teams that send too much defensive attention on them.
One non-shooter (Rondo) is easy to work around.
Two non-shooters (Rondo + Daniels) is a little dodgy but okay
Three non-shooters is (Rondo + Daniels + backup PG) is highly worrisome