The difference? Josh Allen was still making jaw dropping plays every game several times a game. Still waiting for one from Tua.
In his first start, Allen hurdled pro bowl MLB Anthony Barr and then did a superman lunge for the pylon after outrunning Barr to the endzone for a TD.
Tua simply doesn't have the physical ability to ever do that. Which is why no matter what he becomes the Dolphins will always still be limited by him.
You can accept the truth or you can keep holding out hope.