I think it is definitely good for us that TP will be fresher.
Pop is on record as saying that he NEVER called a play for Leonard in the Finals; whatever Leonard got came out of the flow of the offense and/or his own creation.
That didn't keep him from scoring in the finals; it shouldn't keep him from scoring any time.
One of the things that people seem not to recognize is that Tony is running the plays that Pop calls; he almost always gives the ball up to Tim and then starts running - either the loop play or a drive and cut back to see how the defense reacts. Depending on what happens, Tim then gives the ball to another offensive player or back to Tony who then looks for another offensive set to run.
Pop is unlikely to put a minutes cap on Parker as much as he is likely to make sure he is running the offense as Pop wants it to be run.
At 32, Parker is less likely to be initiating a fast break than Leonard is. And if Leonard starts it, he can finish it. Lots of transition points available for the taking.