What do you Fans think happened to Mr Turner he was never seen again after season 4 he was mentioned by Minkus in season 5 maybe he thought cory and shawn were trouble makers and decided not to be a friend or teacher to the both of them anymore.

The same reason they dumped Frankie I suppose. Season 5 made a few jarring changes like making Feeny the only teacher.

They also made Feeny a stalker what kind of teacher follows the same students from middle to high school and then to college but he never really cared about shawn or topanga he only cared about cory, i think cory would not have been the nice trustworthy guy if it was not for creepy feeny lol.