Where would you put Usman?
Idk it's so tough to say. We don't have a complete career of the fighter and see - Aldo, Penn, Cruz, Fedor, even Holloway now, McGregor, etc. These guys continue to fight then fall off a cliff, even guys with lesser legacies that once burned bright like a Woodley or Weidman.
I guess I'd have to flesh it out:
1A. Jones
1B. GSP
3. Anderson Silva
4. Fedor (I guess?)
5. Aldo
6. Cruz
7. Mighty Mouse
8. DC
9. Adesanya
10. Cejudo
11. Usman (I guess here?)
12. Penn?
13. McGregor
14+. Couture/Lidell, Shogun, Frank Shamrock, Hughes, Holloway, I forgot Volk at this point he's higher probably ~8-11, Miocic, Dillashaw honestly deserves a mention, Edgar arguably higher up...
I think ~11 is the highest I'd put Usman. Maybe 9-10 at very most. I think he fought a lot of sneaky low end competition i.e. Masvidal x2, arguably washed Woodley, pre-title weak comp. Losing to Edwards twice in a row hurts his legacy a lot.
That list is also rough. I personally weigh double champ, high end achievements, top tier wins the most. I don't care that the UFC gave you two free title defenses when you fought Jorge journeyman masvidal with zero TDD twice in a row for example, or Izzy defends against some arguably bums like Vettori, Costa, 40 year old Cannonier.
To me, Izzy getting dominated in grappling by a weak LHW champ in Jan hurts him. Where as GSP beats a weak MW champ in Bisping by finish, and DC goes up to HW and beats Miocic initially, McGregor for however polarizing he is put the emotions away...he was a legit double champ and finished the FW GOAT by KO then beat a good LW champ at the time in Alvarez by dominate performance/KO. Cejudo became double champ.
I think that means more than racking up title defenses without context. Again, MIghty Mouse a prime example. You can critique Silva's competition too honestly, but I do believe he could have went to 205 and won the belt...He destroyed a recent champion in Griffin and beat Irvin there easily. A lot of this is subjective though. So I put DC 8th there, he could easily be 12-15 too...sure.
I'd say this is important - Name the top 5 wins of said fighter. What are there best 5 accomplishments in the sport, top 5 wins.
If we're putting a 40 year old washed up Silva as Adesanya's top 5 for example, then there you go. If we have to include a split decision win and 2x wins over Dodson for Mighty Mouse's top 5 wins ever...okay there you go. I'm not putting those guys top 3-5 ever. They never had elite competition. And I think someone like DC is punished legacy wise, because he had to go against the GOAT probably in his division. He might be top 3-5 ever, but you can't really put him there.