I believe the case against red shirting is not that the player is bad. But that if the player is awesome, he won’t stay for that 5th year.
Brian Cardinal is a bad example because a lot things have change in ncaa basketball.
Sasha is a good example did he improve enough to be a great player his 5th year? Maybe.
Tkr is an excellent example! However, this is his 4th year. If he has a great ncaa tournament, his draft stock may rise and he may decide to leave and turn pro. If he does decide to leave that provides strength to the people who claim red shirting is a dumb idea. If he decides to stay, it provides strength to the argument of redshirting.
We shall see what happens