Allen and Sanders keep being brought up because they're the only others to have done what Jeanty has done in 12 games. That's a dead simple empirical statement.
I'm beginning to wonder if you're just arguing to argue at this point. I flat out stated, exactly for the reasons you cite, that when the nation's leading rusher in '22 (and the next 2 for that matter) wasn't even in consideration for the DW it was because of where they played. Jeanty is different. This is not my "opinion". He may still win the Heisman. He's going to win the DW. He's a lock for AA and almost certainly the 1st RB taken. That's entirely due to what he's done on the field in spite of where he played, not because of where he played. Your comparisons are contextually flawed.
Which brings us to your last point which only emphasizes your disconnect. Has anyone argued Jeanty would have gained 2288 yards in the SEC? I sure as hell haven't. I'll state right now prime Barry Sanders wouldn't have either. Where you're simply faceplanting with your appeals to the transitive is that a 1 to 1 comparison isn't relevant. Do you know if Jeanty were in the SEC he wouldn't still be the leading rusher in the nation but with "only" 1700 yards and in the same Heisman/DW scenario he is now? Would he? Damned if I know. What I do know is you've got the square root of jack to counter that being the case. That's why such speculation on that shallow a level is meaningless, for or against Jeanty. He's done what he's done on a literally historic level and individually looked good doing it. That's what has elevated his status among awards voters and NFL scouts beyond some smaller school back with good numbers. That you're practically maliciously opposed to such a simple observation is franly weird.
It will be interesting to see how things go later. On paper it shouldn't matter how good any RB is a G5 OL shouldn't be able to hold up to a good big school front 7, certainly not regarding depth. Having said that quite literally the point of individual accolades is a function of looking at the individual and not the team.