Seismic's point is a point worth making. Nobody with a brain would pick this guy to beat a trained fighter, even if he does have 100+ pounds on them, but if you don't think that it's even possible for him to fuck Mighty Mouse's or Nate Diazs' shit up then you're just ignorant. Remember, Gunnar Nelson got injured trying to armbar Thor, while Gordon Ryan is literally the GOAT - and he eats more horse meat than anyone who's ever been on a mat - and even he struggled with Thor and Martins Licis just due to the sheer physics of dealing with significant discrepancies in size and strength.
When I was a brand new, shiny-white-bealt-wearing, 170-pound teenager starting in BJJ, I rolled with a brown belt multiple time Judo and BJJ champ...she also happened to be a she, a small little Asian woman. My instructor told me not to close my guard if I was on the bottom (because she'd be too weak to get out of my guard) and to "take it easy." And I did. I probably had 50 pounds on her at most, but she did nothing to me, because she couldn't do anything to me, and I did nothing to her, because I could've done anything to her. I just focused on position rather than gorilla-ing kimuras out of her. Even still, I cleared her half guard half a dozen times in seconds, and just to try it I was in side mount with my right arm under her head and I used my left hand to reach across and pull her hips into me and I could've just kept her there no matter how much she tried to scramble on the bottom.
Size and strength are not the be all end all - Royce Gracie proved that to the world way back at UFC 1 - but to pretend that size and strength are nothing is just ignorant.
Now, having said all of that, if this dude ever steps on a mat with Mighty Mouse, I predict a Mighty Mouse arm drag to RNC or Imanari-style leg lock in under 60 seconds