today i grappled with a lad 4 stone heavier than me who only knows one way to grapple very heavy and very intense . he caught a arm bar on me and i fthought he had snapped my arm ,he was very apolegetic and concerned about my arm its not like he did it on purpose but he 20 years younger than me and 4 stone heavier on me and more skillful than me. i am i going to learn anything from grapppling with him he taps me out every time you see, and does 4 stone make a difference in grappling ?