Kongo's only been submitted by Mir after he was pretty rocked, however I think Struve could pull off the sub here too.
Kongo's style is all about bullying and clinch work and I don't think he can achieve that too successfully against Struve. Kongo's got solid power for sure and nasty GNP when he feels threatened on his feet, however I believe Struve has the edge in too many of areas, whereas Kongo's advantages aren't as substantial.
All that said, I haven't been impressed with Kongo since like, UFC 92....
MY MMA RANKINGS
HW Velasquez Cigano Werdum Cormier Bigfoot Barnett Mir Browne
LHW Jones Machida Evans Hendo Davis Goose Teixeira Shogun Mousasi Bader
MW ASilva Rockhold Belfort Weidman Jacare Okami Kennedy Consta Belcher Boetsch
WW GSP Hendricks Condit MacDonald Diaz Maia Fitch Kampmann Ellenberger Pyle
LW Bendo Alvarez Maynard Melendez Thomson J.Miller Diaz Pettis Chandler Grant dos Anjos
FW Aldo Mendes Curran Lamas Frankie Zombie
BW Cruz Barao Fernandes Faber Moraes