I don't know about saying Chinyelu has no NBA potential. Teams need role players and Chinyelu is a significant defensive presence with impressive measurables. Big, strong body with a 7’8” wingspan. Has some scoring ability around the rim and doesn’t hurt you by trying to do too much. Was projected as at least a 2nd rounder in mock drafts, so somebody at least thinks he’s worth being selected by an NBA team.
Compare Chinyelu to Quaintance. If healthy Quaintance has more bounce than Chinyelu, but in things that impact winning it seems Chinyelu otherwise compares well. Likewise, if the argument is that you can’t play in the NBA if you’re not a 3pt. threat (not true by the way), then Quaintance better come back to UK for an accounting degree or something. Basically, I don’t see why Chinyelu couldn’t be useful on an NBA team and I think he probably will.