His point is that so are Rosen, Darnold, and Mayfield. It may be a dubious claim, but what are these objective measures? Do you have stats or All-22s that show the other three first round QBs adjusting at a faster rate. My unscientific eye/stats test has it at Mayfield, Darnold, Allen, Rosen, but that is certainly subject to dispute.
Ok, fair enough, I edited this, b/c I do see you have a posting of someone's All--22 analysis, so that's at least something.