I'm with thethe on this. I think the book, ten-plus years ago, was that top prospects didn't "need" AAA, because that league was mostly filled with non-elite prospects, fringey MLB guys, and career quadists. But I think we've come back around from that now, and most teams give their elite guys some time in AAA—realizing, I think, that the average rotation in AA might have younger, harder throwers, but that it's useful for a developing hitter to accrue some PAs against guys who have more advanced understanding and deployment of sequencing, better control, et cetera. Ditto for pitching prospects facing fringe and AAAA hitters who have a better idea of what they're doing at the plate, even if they aren't top-shelf prospects or major-league caliber starters. One effect is that an elite guy's also going to face more fellow elite guys cycling through AAA.