It's another factor. And a significant one in a fight where the winner won by a single round I would say it was significant.
Cement shoes and slow in every form of movement is absolutely by far an exaggeration.
Yes Ferg uses his chin and cardio as an asset. But what if his opponent doesn't slow down? Or what if his opponent paces themselves at a pace they know they can fight for 5 rounds? What if his chin finally gives out from cutting so much weight and getting wobbled pretty hard or cracked pretty hard rather often?
My point is there is a big gap in skill between him and the top lightweights. He fills that gap with cardio and toughness and when fighters figure out how to negate that cardio and toughness like Diaz he will be beaten alot more regularly.
I feel Khabib fight is going to be that fight. The blueprint to beating him is shaping up more and more with each fight he has and Khabib is watching and learning. I believe Fergs willingness to give up dominant position on the ground and his habit of waiting until his opponent gasses will lose him the fight.
I've watched RDA/Ferg probably 5-6 times (I bet a lot of MMA-normally post in the betting thread) and RDA is already slowing a little BEFORE the eye poke. It's not that he has bad cardio, Mexico City was doing that to everyone. Except Tony. RDA was way, WAY slower just 11 minutes into that fight than he was early on. He looked like a guy who'd hit a wall, while Ferg somehow INCREASED his output.
And you have to realize, the pressing forward that he does is by design to FORCE opponents to NOT BE ABLE TO PACE THEMSELVES. He's always coming forward, trusting his chin, MAKING guys fight him on his terms. The downside for him is that he takes damage. The upside is he forces guys to fight a high energy fight and they can't match his pace, they wilt.
There isn't a "big gap" in skills. That's you ignoring that he WANTS his fights to play out the way they do for the most part. Yeah he could be more conservative and showcase what you consider "skills" more probably, but then he's not forcing his opponents to tax their own gas tanks. He's talked about this multiple times. Fight after fight he does the same thing to guys, riding an incredible win streak, but somehow you attribute it to "waiting for guys to gas". Which is stupid. He's MAKING them gas.
Now, as I've said, this isn't a sustainable way to fight if you want a really long career. His chin will give out at some point, his body may break down earlier than some other guys. But that's not happening now.
Khabib may well win. I think this fight is close to even, and Khabib brings things to the table that are a nightmare to deal with. Ferg may get trapped under Khabib in a spot he can't get out of. He tends to take chances on the mat that (as you said) can lead to him giving up dominant positions. He may need to play a more conservative bottom game than normal, making Khabib work like a dog for every inch, playing more defense. Forcing Khabib to work more in his full guard (easier said than done, but Ferg is capable if he doesn't take too many chances) and throwing elbows off his back.
But Ferg brings things Khabib hasn't seen either. An endless gas tank, possibly the best the sport has ever seen. The ability to also sustain damage without it affecting his output afterwards. A tricky striking game that comes from odd angles. Insanely long arms that can get the neck more easily than other guys.