Manu is a threat. He can use that to set other guys up without being the goto guy. Whats more, he can drain the three. His outside game alone opens up opportunities for other guys, much less the threat of his drive. But bottom line, he has tremendous vision and plays extremely unselfish. He is always a safe bet to find the open man.
You say he is "used to playing off the ball," but he's already shown he can play anywhere, anytime. He is a playmaker, but last season he let it be know that he could feed guys in the flow of the offense all day. And the more he is looking to create for other guys, the less he is pounding on his own ankles down the lane. Manu at the point adds years to his career.
Parker is a playmaker, but not a facilitator, unless youre talking about TD in the pick and roll. Or unless we stack our roster with outside shooters that allow him to drive and kick. TP is deadly, but I like him as a straight up shooting guard, Manu at the point, and Hill off the bench or for specific match-ups. Rely on Tony for scoring (hopefully resurrecting his shot is a huge priority in summer workouts), rely less on Manu for points and more for assists and outside shooting. Works all around.