I get it. I also get that Brady's season as a whole was not the quality of being elite. He had flashes, but that isn't consistency. Brady very good nearly right off the bat, but he wasn't elite yet.
Brady a lot of the tools that only elite QB have. But he still had a lot of things to work on from his mechanics and his abilities to read defenses. He limited playing time in college to refine his skills. To his credit, he worked harder than everyone else to become elite. No one worked harder than Brady. Without that drive, I doubt he would have ever become more than a really good QB. Luckily he had it.
There are other QBs in this league that have far better physical skills than Brady. But they don't have the drive to become better. Marcus Mariota has the skills to be a Hall of Fame QB, but he doesn't seem to have Brady drive to pull it together. So he is likely to be a journeyman unless he finds a system that will get him to work on those skills.