One thing I have always noted, I never see big guys complain about small guys and their flexibilty/cardio/speed or anything. I do see alot of small guys want and excuse for getting beat on in practice by bigger guys.
It most certainly makes a difference, but in my experience it usually isnt the only reason for a one sided ass beating if guys are grappling. At worst its a great chance to improve in bad positions and really understand you CAN NOT let a person set a dominant position on you (meaning even if guard is about to get passed you just cant stop moving, ever). At best you get to deal with finding new means of attack (in my experience smaller guys biggest problems is they have games in some cases simply not adapted to that big ol guy mashing them, meaning they try way to hard to submit big guys rather than sweeping/attacking angles to take the back/swapping between those two, with an occasional submission tossed in, that you give up on if stacked at all) instead of one shot wonders (often its the triangle guys who have a tough time with the guys with the ox neck and stack from hell) of intant submission from their backs.
As for the theoretical 265# with a good guard, I train with a guy who is tall (6'3") and big (255#) and has a very good guard and great hand control. Its a nightmare. Big guys can develop very good guards that play to thier strengths, but, they have to be willing to do it in training, and most big guys cant divorce the ego enough to really buy into this.
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