I've held some big sweaty fuckers in my RG without tights before. I get what he's saying but I still think the RG is the way to go. Not just for posture but for methodically getting that sub without giving up space or risking him escaping mid transition. Just my white belt theory though! I tapped out a purple belt over the weekend and I could see that helpless look in his eyes as I went from mission control, double bagged, chill dog, invisible collar, pumped the arms in and took the arm bar. Not always the case but I find the RG one of the best methods for me personally to get the finish.