No there isn't better talent in AA than AAA. There's more potential perhaps but not talent.
Your AAAA types in AAA means they have enough talent to play in the majors but not stick there. If your average AA player had more talent they wouldn't be in AA . Part of your talent comes from experience and adjusting. Plenty of AA players never advance beyond it.
Look at Montgomery. Everyone knows he has great potential , but he lacks the experience of fringe MLB types He may have taken all that coaching about plate discipline a little too seriously . Right now he's leaving the bat on his shoulder too much. Experience will teach him how to be a good hitter and still take walks. It's very nuanced and part of the learning curve. AAA is for playing against better more ripened players just a notch below MLB quality.