Cain gives off that "limitless potential" vibe.
Kongo seems to aways seem to choke when the chips are stacked and he doesn't really seems to have that drive to further himself past his frailties that say a Gonzaga would.
Kongo's a freak, but I think Cain has the overall better culmination of skill.
MY MMA RANKINGS
HW Cain JDS Werdum Cormier Barnett Bigfoot Overeem Mir Browne Nelson
LHW Jones Machida Evans Hendo Goose Teixeira Davis Shogun Mousasi Bader
MW ASilva Belfort Weidman Jacare Okami Rockhold Kennedy Consta Bisping Boetsch
WW GSP Hendricks Condit MacDonald Diaz Maia Fitch Kampmann Ellenberger Pyle
LW Bendo Alvarez Grant Melendez Thomson J.Miller Diaz Pettis Chandler dos Anjos Gray
FW Aldo Mendes Curran Lamas Frankie Zombie Cub Lentz Kawajiri Siver