Not only has RDA never been submitted, but ever since the broken jaw vs Clay Guida:
Paul Felder
Michael Chiesa
Leon Edwards
Kevin Lee
Kamaru Usman
Colby Covington
Robbie Lawler
Neil Magny
Tarec Saffiedine
Tony Ferguson
Eddie Alvarez
Donald Cerrone
Anthony Pettis
Nate Diaz
Benson Henderson
Jason High
Khabib Nurmagomedov
Donald Cerrone
Evan Dunham
Mark Bocek
Anthony Njokuani
Kamal Shalrous
Gleison Tibau
George Stropiloplilous
24 fights vs a killers-row and only 3 guys even did any real damage to him; Usman(130 strikes) & Tony(199 strikes) did it through attrition over 5 rounds, but only Eddie was able to actually hurt him and never actually dropped him!
Which begs the question, just how hard does the real hardest hitting 145er hit?
RDA may have fought the hardest schedule of all time, especially considering how historically deep 155 & 170 have been. All due respect to Hendo, Overeem, & Mousasi etc.
So much respect for this legend, & I think he is a live dog vs Fiziev if he is just as durable as before the layoff. Mix in takedowns, clinch against the fence, eventually wear him down for a late head-n-arm choke or win the last 3 rounds.
And if he does lose I hope he gets the Arlovski/Miller treatment of testing younger limited action fighters. Winnable fights.