I think the point dabys is making is that often AA pitchers have better stuff and you'll more commonly see better caliber pitchers in AA. The common logic is that AAA is a higher level and thus better pitching. The reality is more that it's a home for guys who didn't make it in the show their first go around and a lot of 4A pitchers. That's not an absolute certainty. However, the difference between AA and AAA isn't so much talent as it is polish. So, in the case of a pitcher going from AA to AAA you're often talking about similar stuff but someone who either needs more polish with a pitch or has trouble locating a pitch...etc. In the case of hitters, it's plate discipline typically.
In the case of Bryant, in his two AA level stints(AA and the AFL which typically has AA level pitching) Bryant has walked 15.2% and 14.3%. So, while higher polish pitching may walk him less, even if it drops 5% you're still talking about a pretty good 10% rate. The question becomes is the increase in polish enough to raise his K rate. That's harder to answer. Without having something like pitch f/x it's hard to get a sense of how Bryant is doing his damage. Is he feasting on pitches left in the zone where AAA might not have that issue? You could argue that is the problem Baez has had along with his aggressiveness. Is Bryant instead too patient as I and others have argued?
I'm still convinced they will slow play things and give Bryant more time in AA. Yes he's absurd there at the moment but you're talking about what 3 months of play? For one thing, we've seen guys in the majors get hot for 60 or so games and then fall off. So, while it's doubtful that is what will happen, it's possible. Southern league is 138 games. The smokies have played 68 games. That means they've got 70 left. If super two is mid-July you're talking another month you're talking roughly another 27 or so games. If they indeed plan to call him up to the majors, you don't want to just give him 27 in AAA. Typically, you'd probably like for them to see at least 300 PAs in a level. A call up to AAA really would only make sense if they were considering a September call up after the playoffs for AAA are over.