I mean, obviously this year is different, but in general:
Mahomes
Burrow
Allen
And I'd say Herbert and Lamar
Are better.
I know Herbert hasn't yet won a lot of games yet, but in his 3 seasons starting, it's not as if he's choked a bunch of times. He's had enough game-winning drives.
But after that? The only person you could even argue over Tua is Hurts, but that season last year is doing a lot of heavy lifting for Hurts. And Hurts has always had a good line, as where Tua had some bad lines early on.
So yeah Tua is at minimum top 7. And depending on how you feel about Herbert, Lamar, Hurts, etc. Tua could be top 5 as well.