Yes, always interesting to speculate how these guys would have done earlier in their careers Green faith and good points you raise as well.
Here is my speculation on it -
KG would have the "Bird effect" on Paul and Ray, just like Bird did with the 80's Celtics.
He would have demanded it and Paul and Ray would have followed. Mostly because both Ray and Paul are, in the end, class acts. Also because KG is, like Bird, an immovable object and he's contagious.
Paul and ray are fierce competitors and they would come around pretty quick when they saw that wins and rings were for the taking with KG at the helm. Pierce would have taken a bit longer maybe.
But Pierce has always been a gamer and with real help around him he would have blossomed sooner rather than later.
Pierce really needed a guy like KG early on, much like Pippen needed Jordan.
Certain guys are born Celtics to me - Cowens, Bird, Russell - and KG fits that mold - so does Durant. It's really important guys like them find a championship home early in their careers because it's such a waste of greatness on a basketball court if they don't. Much like KG in Minny. Minny either needed to make it happen quick like with Durant in OKC, or KG needed to get out.