24 isn't old for AAA, we all loved d'Arnaud and he's 24 in AAA, Mike Olt is 24 in AAA, Jackie Bradley was 23 in AAA, Rendon was 23 in AAA, Wheeler was 23 in AAA this year, Hultzen is 23 in AAA, Billy Hamilton and Trevor Bauer will be 23 in AAA next year.
Pillar has a shot if his speed continues to play, keeps the K's down and maintains his gap-to-gap power. He doesn't have star upside though.