Good coaches don't start the highest recruiting service rated QB, they start the one who proves he can reliably perform best and win games. Presumably, that's why Hooker won the job over two higher rated QB's at UT. Likewise, after Daniels was injured, Stetson Bennett didn't get and keep the job because he was just a game manager, he kept it because he was executing the full offense, particularly in the 1st half when games were in doubt.
Comparing 1st half passing stats of SEC teams (cfbstats.com), Georgia had the highest rated passing offense, highest yards per passing attempt, and 3rd highest first half passing ypg in 2021. UGA had more than twice as many passing yards as rushing yds in the 1st half of games (169 to 82). They did that despite a banged up receiving and TE corps, which resulted in UGA's receiving yardage leaders being three freshmen and a sophmore (two 3 stars, two 4 stars), followed by 2 running backs. The result was an average halftime lead of 17.5 points (FBS only games), largest in the country (teamrankings.com). In the 2nd half of most games, Bennett was indeed a game manager, because that was appropriate with injured receivers, a big lead and a good defense.
So yes, three 5 stars have transferred, but not because Smart only wants "game managers". One (inherited recruit) underperformed and lost the job to a true freshman. One wasn't ready as a true freshman, got impatient and announced to transfer before his freshman season was over. One intermittently missed multiple games and parts of games due to various injury issues, until finally the coaches decided it was too late in the season to switch QB's again and stayed with the backup who was consistently performing well.