It's always hard to objectively compare previous draft classes with an upcoming one since we know how previous classes are currently faring in the NBA, but I can say for certain that I would have had Mobley and Cunningham above anyone in this draft class, and probably in their own tier at the top of the draft.
I'm just not sure that Smith Jr, Banchero, or Holmgren are the types of talents that can really transform a franchise.But I agree that Ivey might be that type of player.
That's not to say I don't like those three, or that I don't think they have a chance to be really good, I'm just not sure they're superstars. I'm not as high on him as others, but Banchero probably has the best chance of hitting that elite level, especially if he develops more as a playmaker. There's also a chance that he's a volume scorer who doesn't contribute as much as he could to winning. We'll see. Jabari would really need to improve his handle and ability to create his own shot beyond his current repertoire of fakes and jab steps. I think he'll be a productive stretch 4 regardless, but how much he improves his individual creation will likely determine his ultimate ceiling. Holmgren, even if he gets bigger/stronger and his skills translate to the next level will likely not be the best player on a good team. I don't know that he'll ever be a go to scorer but he could potentially contribute in a multitude of ways: blocking shots, stretching the floor, initiating the offense from the high post, scoring inside, rebounding etc. But shotblocking is really his only elite skill. Everything else he does currently is a bit amazing because of his size, but it remains to be seen how much of it translates. So much of his high school highlights were him handling and attacking the basket like a guard, but so far at Gonzaga he's really played much more of a traditional big role, beyond the occasional coast-to-coast baskets.
All that to say, I could see any of those guys being good, but it's much easier to see how Ivey could become great. It doesn't mean he will, but the path to being a franchise player seems much more obvious for him than the others. And honestly, I think he'd pair well with Haliburton.