Akok is not nearly as bad as you are suggesting. You choose some weird hills to die on sometimes. He's an excellent defender. Are we even watching the same game?
Whaley is definitely marginally better defender. But he's also a better defender the 99.9% of college players. However, If he's gonna blow it on offense this bad consistently, it really isn't worth the better defense. It's not like our D is bad without him.
I suspect Whaley will regress to the mean soon enough. He isn't going to shoot 1/8 forever.