It's quite convenient for you to take my post out of context.
Strength does play a part, but being able to curl whatever is irrelevant.
Core Strength is what is important.
George Foremen got his strength from Chopping Wood for hours on end. Todays fighters mimic this same technique by Sledgehammering Tractor Tires.
Certain Isometric Exercises are beneficial to MMA but most of it relies on Compound Movements, Core Strength, Explosiveness, Plyo's, Calisthenics, etc. Not Bicep Curls
You could even look at Anderson Silva who looks like he's never even been to the gym and touched a dumbell or straightbar probably developed his Clinch Strength from practicing Muay Thai and perfecting his technique.