Fight IQ
1) A fighter's ability to understand where he or she is most effective in a combat situation and actively pursues this in fight. ( Long range , short range, stand up vs ground ETC)
2) The ability to adjust their initial gameplans throughout the fight, to have more then one path to victory based on real time data or changes in a fight is a sign of high fighter IQ.
3) Creativity and Fluidity while remaining calm between techniques particularly in the application of offense and defense is the final sign of high IQ fighter intelligence ( leg catch to spinning elbow, A takedown directly into a submission, setting traps and capitalizing them in the stand up , being able to nullify an opponents best technique)
With that said my nominations
Jon Jones
Georges st pierre
Demetrius Johnson
Kamaru usman
Amanda Nunes
Izzy
Stipe ( particularly in the second D.C fight)
Khabib