Yeah but could Valesquez KO JDS with a take down or something? Likely not.
How about GSP TD's? Did they KO his last 6 opponents? (not comparing the 2)
Once it goes to the ground, it's purple belt vs brown belt (under Maia and Nog).
That's like, such a tremendous skill difference. Not to mention JDS has an excellent clinch game. So really the only advantage he has is in take downs - but not groundgame and certainly not clinch and definitely not striking.
Definitely taking sigbets for Valesquez vs JDS if that ever happens.
Don't forget that JDS got his brown belt not too long ago, he was purple just a few weeks ago.
What your completely overlooking here is that Cain will most likely be on top, JDS bottom. So unless JDS has some Big Nog-esque sweeps and bottom game (not likely), his BJJ gets neutralized with Cain's top control.
Ftr, I'm picking Big Nog over Cain.