... during their championship run?
brock.. yes
anderson.. yes
edgar.. no (obviously)
shogun (been tested but not as champ, too new)
gsp.. no (serra loss doesn't count, because that was a fluke, remember? but that wouldn't count anyways because he never came back from it)
nog.. (WHEN he was champ) yes
fedor.. (WHEN he was champ) yes
the sign of a true champion is one like anderson, brock, who have been tested to the absolute limit of their abilities, to the point where the everyone thinks they are GOING to lose, but rise above, somehow, some way.
long live MMA.