So is Jared Goff. Trent forking Dilfer won a Super Bowl thanks to great defense and a running game. That's a really low bar to cross for a QB.
Moss played four seasons with NE. Hernandez was every bit as good as Gronk, then he got pinched for murder. Gronk is probably going to be the most prolific TE in NFL history. Brady did not make a career out of turning no-names into All-Pros. He made a career out of having a great defense backing him up year in and year out, a front office that knows how to get the most out of every roster slot, generally having at least one household name catching balls and plenty of shady sheet sprinkled in.