I'd also add that knowing your body type and what you can and can't do is part of decision making. Zion can play through contact much more easily, so taking it to the hole against 2 defenders is not as bad a decision as it can be for RJ sometimes. RJ is good at playing through contact, too, just not at Zion's level . . .
And I think maybe it's still too early to draw conclusions from stats through 14 games. For example, last game, Zion had 5 assists and 4 turnovers, but 2 of those turnovers should have been easy assists. 1 was a bounce pass to Jordan on a fast break that should have been a layup, but Jordan tripped over something and fell down. The other one was a wide open dunk for Javin where Javin just didn't anticipate the pass coming at all.