Wemby got a high center of gravity like KP. Just because a nikka 7ft+ dont mean he can be effective postin up.
The great post players got that strong core, low center of gravity - Hakeem, McHale, Shaq, Barkley, Duncan, Jokic etc.
Its why despite Hakeem lessons Dwight was still a

post player. David Robinson was never a great post player for same reason.
KG another one. Ralph Sampson... Wemby frame in line with these players not the list I listed before which Sengun got more they body type or strength, core.