My realistic list of possible off-season centers
1. Embiid, need to get lucky in lottery but health with standing Embiid, Sully and KO could be the 4-5 rotation for a long time
2. Asik, even if embiid is drafted my gut feeling is there is already a draft day deal in place.
3. Sanders, high risk / high reward player could make a Deandre Jordan like jump in production on the right team. Could also just be an addition to Aftroman's Song " But I GOT HIGH".
4. Biyombo, the potential is there and has been defensively productive in limited minutes. Those who look at him as only 6'9, he has a huge wingspan and standing reach. His physical profile is similar to Ben Wallace.
My preferred list of centers to go after:
1. Embiid
2. Hibbert
3. Monroe
4. Asik
5. Gortat
6. Vonleh
MAKE IT HAPPEN DANNY!!
Out of your list I dont think Hibbert or Gortat will be available for the Cs. Pacers wont trade Hibbert and Wizz wont let Gortat get away.
Monroe and Vonleh (baring another growth spurt) are not rim protectors. Much like Sully and KO they are both big 4s who can give you backup minutes at center but will not excel defensively at the position.