We have a dum dum white belt at the gym that brags about getting the back of the coach, later in the month he caught a brown belt in an ankle lock and he bragged about it too. He didn't understand that they put themselves in tough positions to have some challenge.
One of our best guy told me to start from the side mount today, I'm pretty sure he wanted to work on his kimura trap game, he still got me like 5 times but I managed once to get the full mount and giving him some threath, but I'm not stupid, I know that if he was going full speed I would be dominated and not even close to pass his guard.
Anyway, practice is practice, you can draw a tangent about how it goes with some of the guys when you roll often with them, but you don't get to fuss about one roll and say that you're the best or that you suck.
Anyway, it's a place to try stuff, the first time I tried RDLR, guys that never pass my guard were knee cutting me at will, after a couple of tries I figured out some stuff and it's now a good position for me. If I was just trying to not get beaten I would never have worked that out.
Pride is the worst enemy of your progress