Finally caught up. Seems like people are either on Gall/Perry or Sage/Jouban. Resisting the temptation to pick a side, I like Gall/Jouban.
While I wouldn't be the least bit surprised in Sage winning by tko/dec or Perry putting Jouban to sleep I look to the following as the decision making factors:
We know that Gall has good Non-MMA grappling and so far has demonstrated good overall grappling (albeit against absolute cans) + we know Sage has shown some major holes in his grappling. I am also putting my faith that Gall is decent on his feet/tough enough to get into the clinch and work takedowns. He seems too confident to be scared to get hit and quit in a fight (something Sage has done in the past). I currently do not have a bet, but will probably stab Gall sub line.
I agree Perry has the better chin and probably carries more power, but I do not see many (any?) wrinkles to his game. He has good hands, but just wades into the pocket without any real set-up. Jouban has a much more diverse striking game and has shown to have pretty solid clinch skills as well. This is where I think he can win the fight, either staying outside the pocket and range strike or if forced into the pocket look to clinch and punish Perry there before resetting to the outside. Again, Perry could walk out and starch him and I wouldn't be surprised, but if odds continue moving towards Perry I will probably place a bet on Jouban, in addition to fight ends ITD.