One thing I've learned, the hard way, is that QB is the position that translates the least from the practice field to the games. They can't get hit, which affects everything they do.
When Stephen Morris was entering his senior year, Golden was telling people he was a Top 10 QB in the country. I agreed. Morris was tossing dimes all over the field and looked in total control. When the games started, he sped up his process and his accuracy suffered.
Kaaya was the same deal. Richt told boosters Kaaya was the most accurate QB he'd ever been around. Kaaya put on a show in practice. In games, his lack of quickness got exposed behind an average OL.
Rosier had the best camp of his career last August. He was under control and seemed more confident. When the games started, he got exposed because the opposing defenses had a read on his (and his playcaller's) limitations.
That's a long way of saying: don't overreact to QB practice reports. I'm the biggest culprit myself. All practices show you is skillset. It's not hard to see that Jarren is the best passer in the group. Tate is the best athlete. Kosi has a little bit of both, with the ability to make different types of throws. This competition won't be done until someone establishes themselves as the QB in real games.