GOAT arguments are so subjective.
As a Peyton Manning fan, I've been arguing for years that Drew Brees and Manning are both better QBs than Brady. Brady's stats are great, but not as good as those two. I finally quit trying to make that argument because Tom Brady leads stats where it matters, winning. I'd certainly like to think Manning and Brees could have won just as much with Brady's defenses and running games, but I guess we will never know. Brady is the undisputed NFL GOAT.
With Brock Purdy, he is the best QB in ISU history by BOTH the statistical category and the winning category. I'd like to think that earns him the GOAT status QB wise. Love this kid and will enjoy watching the rest of his career at ISU. Love Seneca too, but by the two best metrics we have to really show who was best Purdy leads in both.
I find a harder argument saying he is the GOAT player over Troy Davis. Davis was a statistical machine and invited to the Heisman twice getting runner up once. He may not have won as much, but his accomplishments are hard to argue with.