I'm pretty sure that Delonte would toe the line if he resigned. Remember he was pretty effective in Boston but that was before KG and Ray arrived (obviously, he was in the trade for Ray.) The entire culture of the team has changed and I don't think Delonte is going to be challenging the authority of Doc, KG, Rondo or Pierce in this locker room.
He could definitely fit in as a backup to Pierce and Allen. Also, he could complement Nate well as a bigger defender and ball handler.