Also, sparring in the gym should not (always) be about winning and losing.
If I fight a blue belt that is much stronger and heavier than me, he might beat me, or i might not be able to tap him. Especially when he is fighting like it is the Mundials.
Did he beat me because of strength? Maybe, but the realitiy is that I didn't find a way to beat him with my jiu jitsu. So he beat me fair and square.
The REAL question is, what did we both learn from the roll?
More often than not, it is not as much as we both could have taken away from it.
Maybe I had to fight like a bat out of hell myself, just to not get mauled or injured, so my technique went out the window.
Maybe he swept me from sidemount by hulking me over, now thinking it is a great technique. But if he tries the same on someone his size, he will fail. He could have used our roll to work on finding a better answer to escaping sidemount.
More often than not, variations of the above scenario apply.