Are you comfortable with the fact he could be 22 with no offensive game developed whatsoever? If that's the case we are looking at a shot blocking version of Reggie Evans, possibly Ben Wallace at best.
If he is really 18 then there would be hope, and possibly worthy of a #3 pick in a weak draft.
Until someone with medical expertise has examined Biyombo and opposes this Doctor's opinion saying Biyombo is 22 is ignorant.
From DraftExpress.com https://www.draftexpress.com/profile/Bismack-Biyombo-5902/#ixzz1Oh66STYzThe one thing that continues to dog Biyombo are the question marks NBA teams have about his age. Recently converted NBA draft analyst David Aldridge wrote that an NBA GM he spoke with said he had heard rumors that Biyombo was “anywhere from 23 to 26.”
Our research has revealed some slightly different information. Coaches who have worked with Biyombo earlier in his career while he was still in Congo think he's “no older than 20 at most,” while Biyombo's agent, Igor Crespo, has evidence that proves Biyombo is even younger.
Crespo says he took Biyombo to a specialist to conduct a bone age study immediately upon his arrival in Spain (Biyombo was reportedly 16). The study, as explained here involves taking x-rays of an adolescent's wrist and hand to see if his growth plates are still open. Because the cartilage in Biyombo's hand hadn't fused at that point, the specialist came to the conclusion that he could be 16 or 17 at most, but not 18, when growth plates are expected to be closed.
This obviously rules out the possibility of Biyombo being five to eight years older than he's listed, as the wild speculation we've seen recently on the Internet indicates. Crespo says he will willingly share these x-rays with any NBA team that requests them. One team we spoke with has already begun to evaluate the x-rays.
https://www.draftexpress.com