Don't know about Fraudbull, but Fujitora likely wasn't going all out for his allegiances
Moreover only a scene doesn't say much
Revs where going all out in 4 vs 2 while Admirals not and fought in 2 vs 4, remember the difference between Kid and Law vs Big Mom and Kid vs Shanks/Law vs Blackbeard (granted Shanks >> Big Mom and Blackbeard >> Big Mom but you get the point)
Fujitora was about to get serious at one point but they ran away, nothing happened
Remember that regardless of anything, Morley and Karasu are bound to be weaker than Ivankov
The same Ivankov who was mid diffed by Magellan
Magellan who I really can't see surpassing Katakuri, let alone Marco/King, go figure Yamato, go figure an Admiral