Isn't Shannon Brown essentially Nate Robinson, just a few inches taller? I think we've seen what a Nate type player could add to this team, and somehow, I think the management is looking for something different.
I sincerely hope they're retaining Delonte, rather than taking a significant risk for a player with a lot of flash, but not more. If (and it is a pretty big if) Delonte can stay healthy for say, 80% of the games, I don't see why he couldn't be a contender for 6th man of the year. Playing time behind Rondo and Allen should be ample.