Tua has been dragging down the Dolphins and is probably the reason they miss the playoffs in the first place. If they had a real QB they win that division easily. Mac Jones has been good but to compare him to Dak is kind of laughable when you realize that the Patriots have an actual running game which is why despite Dak having played one less game he has 600 more yards passing and 10 more TD passes. Hurts and Lamar have not played well this year at all (Lamar's backup has outplayed him the past 3 games).
Basically I think you just listed a bunch of QBs whose names you knew without giving any thought to whether or not your premise makes any sense at all.
Just looking at the Dolphins at the surface, they lost 4 games with Tua playing more than a few series(first Buffalo game broke ribs in 1st) .
They've won 7 out of the 8 victories with Tua playing, for a 7-4 record. Brissett went 1-5.
Now, when watching Tua, he's hasn't shown anything yet to say he was even worth the 5th overall, but his situation clearly sucks. No offensive line, penny a dozen RBs, and outside of Waddle and Gesicki, his weapons are JAGs.
Dak>Tua to date, but Tua hasn't been
the issue in Miami. An inept owner, a terrible GM and a HC that rumors say he never wanted Tua, lead to a franchise that has been a tire fire for over a decade.