Let me break it down for you, every team in the league allows penetration from guards...u can't hand check for the most part and guards are quick in todays game..it is not so glaring for most teams because the better teams have bigs that play help D...ZZ and AL are not very good individually, and are worse together.
There will always be penetration by guards....but when bigs come over to take a charge or make a block, you see a great play by a big, and hardly notice that the play was there to be made because of penetration.
Better defensive teams make penetration difficult, no team can prevent it, you have to have bigs that move their feet, ZZ + AL =layup drills. Why spend money on Al when Smoove can play that spot better defensively.
Al post up game is really exaggerated, if you watched, he was more of a jump shooter last year.