No one seems to be mentioning that the Celtics would have had Minnesota's pick in the 08 draft. Granted, the pick may not have been a top three because Minne still would have had Garnett. But what if the C's get lucky and Minne still gets that same pick despite having a better record. I think Danny would have drafted Mayo.
Rondo
Mayo
Durant
Jefferson
Perkins
That lineup would certainly be nothing to sneeze at. Durant, Mayo, and Jefferson would be a younger big three. But they would be far more dynamic offensively. Also, the C's would still have Pierce to trade to the highest bidder.