The reason I didn't pick J Allen (who I did consider): I already had Ewing, so I knew I wanted at least 4 usage points from the C position for each season. That's why I took Yao Ming, who is a pretty great backup option for Ewing IMO, though I am leaving a lot of Ming minutes unused. On one team (without Timelord or a good Looney season) I'll be playing Ewing a bit at the 4 to squeeze in some extra minutes from one of Yao's stronger seasons.
So I knew I'd be playing Allen exclusively at the 4 if I took him. At that point I favored Favors and Holmes, since they have the flexibility to play the 3, which seemed important since I'm using two Barkley seasons where he's 96% or lower at the 3 (85-86, 86-87). It also made it easier to construct lineups with 10 usage points, which took some finagling even though my teams have plenty of usage overall.
Maybe that's overthinking things, but that's how I ended up with that combination of big men. Thanks for the evals! Ton of fun to listen to.