Zion's ability to dominate inside is very big especially now that Ingram is very confident already with his shooting and attacking the paint.
If he keeps being healthy, we might see again another player in today's basketball that is dominating the paint. Even though he can shoot 3s, his main offense is coming from the inside. Not just in offense but he is also a good defender under the rim. His presence inside is enough for that specific player not to attempt to attack the rim.
About Brandom Ingram, he's been always acting as the main guy since his Lakers day but sorry to say that he really doesn't have the ability to be the main guy or at least carry a team. He is sometimes on and off too with his performance.
I can't say if he will be as dominating inside or in the paint because there are also a lot of good defenders inside. But the thing with Zion is that he can play outside as well I believed. He can be a threat in 3 point as he can shoot it.
And then he had help with CJ and Ingram. Another option is that he can play post and then pass the ball outside.
I will like to see Zion developed to be a great and elite player, not just known to be power and giving us highlight dunks.