I like Daniels, but I'm not as enamored with him as you clearly are and I'm not putting him in a class with those guys at this point. He's had a great season no doubt, but I'm not going to overreact to it yet. Even CJ Stroud came back to earth a bit this year.
That said, Rattler is pretty mobile. Not to the level of Daniels and Lamar obviously, but he can move around a bit. If line play was designed for it instead of him running on broken plays he'd be passable until we find a better option. Carr on the other hand doesn't move in the pocket at all. He doesn't roll out, can't really step up right now and isn't a run threat. When he tried he missed games.