He one day may be great and hall of famour but let's get real he has yet to beat out Quin who's not other worldly and from the small sampling we have seen he not show a whole lot
This year he is so far 58/84 (69%) with 9 TDs and 2 Ints. He also has 3 rushing TDs. I don't know if he's going to be great but I'd say that's showing a lot when he only started two games this year and they were his first two starts in college football.
Ewers is 3 year starter who up until this year when he has struggled was a likely mid-to-high first round pick. And he still may get drafted in the middle rounds.