The answer to your question is easy Toxic. It's because Gilbert Melendez had an excellent game plan and is obviously better than Aoki.
Okay I see your logic here. So basically B.J. Penn has absolutly no BJJ what so ever because he was able to do absolutly nothing with Frankie Edgar on the ground.
As a matter of fact he has zero striking as well since he was getting tooled on his feet, because if he was world class in those areas he would have destroyed Frankie Edgar.
Also he has no TDD because he was getting slammed on his ass time after time..
I got you. I think Joe Stevenson could probably beat Penn too.... but wait...