What I meant is that we can recognize the style of the members of the org, for instance if I see a replay of alpha I can recognize its his.
I dont think there has been any replay stealer in this clan... Not at least that I can remember.

Well once again testing in game would be the easiest way to know if their replays are actually from them.

What you say about the join date Cata, it is dificult but not impossible yh.. we might face that.