How's that, exactly? Clearly, I'm not a grappler.
I'm not enough of a people watcher at present to observe many of the subtlties that others have been able to catch. However, this thread makes me want to indulge my inner Sherlock Holmes.
Most long term grapplers end up with some level of screwed up ears. Just like long term judoka end up with ugly looking fingers and toes.
But I notice a lot with how guys walk. It's hard to quantify, but I can tell if someone is able to handle themselves by how they walk.
My aikido teacher says you can tell a lot about the level of a martial artist by the way they stop.