Jonas Aidoo, Tennessee
Vladislav Goldin, Florida Atlantic
Clifford Omoruyi, Rutgers
Abou Ousmane, Xavier
Brandon Garrison, Oklahoma St
Moussa Cisse, Ole Miss
Bent Leuchten, UC Irvine
Braxton Meah, Washington
Ugonna Onyenso, Kentucky
Kenny Pohto, Wichita St
Josh Gray, South Carolina
Enoch Boakye, Fresno St
Those would be all of the players rated at least 4-star by Evan Miya that are still available and listed as C. Mady Sissoko would've been right in the middle of that list (between Cisse and Leuchten). All of these player rate higher than Atiki. There are additional players that might be listed at PF that could play at C as well, but these are the players classified as "C".