Rondo should always be the one crossing the timeline with the ball regardless of the other team's fouling strategy. I dont have a problem with Pierce initiating offense in a pick n roll with KG. I dont like just a Pierce iso unless he is hot (think game 7 08 ECSF against Cavs).
The other night, the pick and roll was working and on that play, KG was WIDE open but give credit to Gay for getting a hand on the ball to tip it. I am comfortable with PP making decisions in the end of close games though.