I remember reading about the challenge matches in Blackbelt magazine. Emin is pretty much telling it, that he was challenged when they were trying to make a name for themselves (and yes, they also challenged Mike Tyson to a fight) and then Emin challenged them back and from what I remember they put so many stipulations on it, the fight never happened. Emin was already a name in the martial arts scene before the Gracies came along, Emin wasn't trying to bank on them.
Over on the "Underground Forum", I have read a lot of stuff in other instances where the Gracies were caught in lies that they had told, and then made excuses on why. For Example, Rickson claims to be undefeated in something like over 700 matches but he was beat in a sport compeition one time, but that didn't count because it wasn't jui-jitsu. Also, that Helio lost also when they were claiming they were undefeated for 60-70 yrs or whatever.
BTW: I don't really care for either side, I just don't like the excuses/lies that I have seen them do to promote their style.
"Hard won, buy easy lost. True karate does not stay where it is not being used."