Come to think of it

Watching Rondo play in this last finals made me think. I know that he's got Allen/Pierce/KG, but it still went against all conventional wisdom that he'd play THAT well (5 steals in Game 6). Made me start thinking. What's wrong with letting Blake run the ship another season? He defends exteremely well, shoots a high percentage from three and is a pass-first point. What, exactly is wrong with going with Steve Blake?