He had a very good season in 2016. Scoring TD's while he was leading the team wasn't a problem. Defense and special teams were.
If you want to point the finger of blame at any part of the offense, that finger of blame gets squarely pointed at Malik Zaire.
Malik Zaire shit the bed in two games where he was given significant playing time (Texas, USC), where his ineptitude cost us those games. We were scoring at will with Kizer at the helm against a porous Texas defense, but when Zaire was playing QB, every drive stalled.
Then at the last moment against USC, he had a chance to heave it into the end zone to at least try a Hail Mary. Instead, he simply gave up, or didn't have the courage, and threw an 8 yard pass to St. Brown, which had zero chance of any kind of scoring. You have to at least *want* to give your team a chance, even if it's not very good.
The fact that he couldn't beat out a true freshman, Felipe Franks, at Florida, even though Franks was vastly inferior to Kizer, shows that he simply wasn't QB material.