No it's not a bad call at all. The problem with looking at Andre galvao smashing him in their adcc superfight is that Cyborg suffered from tachycardia shortly before the match and was clearly gassed during most of the match. Most people still thought Galvao's style was a bad matchup for him but EBI 6 gets an opportunity at least at a rematch where Cyborg is healthy going into the match.
Cyborg is strongest as a guard player IMO and Galvao's specific passes that he likes to use work very well against the type of guard that Cyborg likes to play, which is why I'd stil pick galvao. But Cyborg could beat Galvao or Cyborg could win EBI and never face Galvao. Anything can happen here.
It's going to be a longer event for sure. The Atos team often preachers that you never go backwards. So people like Rafa Mendes and Andre Galvao believe never to let go of a sub, because it's going backwards, and that the best place to be is the back. So they spend a lot of time just working on riding the back, because they don't believe in letting go of it once you get there. In this bad ass no-gi match from Rafa earlier this year, he rode the back for the better part of 10 mins before getting the RNC.
https://www.youtube.com/watch?v=vDMAznWHVZA#t=10m13s To be fair Rafa seems to have better armbars from the back than RNCs but that match could've gone forever and he wouldn't have let Quexinho out of back control.
Never even thought about your opposite side of the coin (jaw/arm) stuff. Damn that's pretty crazy and it's a great point. We've seen a lot of escape time wins but maybe we'll see a fastest sub time win, or at least a fair amount of multiple subs in OT rounds. There could even be injury dropouts like back in the early UFC days.
How does the new stalling rule work?
So many questions that you're right, can only be answered by the tournament. Can't wait.