I'm on the fence with Purdy, I put him in the same category as Goff. Both need absolute studs around them, Purdy's the poster boy for Check Down Charlie with great skill players. I believe he was in the bottom half of 20 yard completions this year.
Goff's only as good as his offensive line. Once they crumble, he crumbles. Saying that, he's done something no other Lions QB has done since Erik Kramer.