I guess you didn't watch the Rams game where Jackson lit them up throwing from the pocket. He is an outstanding passer. Just because he is a holy terror running the ball it doesn't mean he is some gimmick QB.
I watched the game and I saw some good passes, some with bad mechanics that hit oppen recievers and some bad basses because of the mechanics. Some flips and on many plays a D that was overmatched by a running QB and had some WR balently open and a QB that didn't threw dimes or his WR or TE open.
With Allen you see that on some plays. For me Allen is the Best QB mechanics and so on. Lamar is better than the other two, but Mayfield is something like Mariotta and Darnold like Dalton. Okayish but not really good.
We will see who in 2-3 years will the better QB and who the one that wins more.
It's like Brees - Brady. Brees is the better QB while Brady is the actual GOAT becaus well he won more.