People heard how Mett could read defenses and work through his progressions. That's a skill. Last year, people started doubting that.
Eh, all we knew about Mett coming out of Butler is that he pushed Murray for the job at UGA. We knew he had a big arm, but not a lot else. Mett learned to read defenses, look off defenders.
He had some timing issues his first year but settle those the second. Jennings has a lot of room to improve but will never ever be able to make the throws Mett could make, and that's what was said about the guy.
You can improve your ability to read a defense, but there's not much you can do about an arm.
Jennings has an average arm but so did Danny Wuerffel so it doesn't mean he is doomed to be an average QB.