I voted no on Mir. He won the belt the first time in a crappy HW division. I mean beating Wes Sims earned him the title shot! The next time he won it, it was not the belt, it was the Interim belt. He didn't beat Big Nog, he beat the shell of a man formerly named Big Nog. The first half of his career was overhyped. Since his return from the accident he has gone 8 - 8.
Now I'll give him that for a man that wasn't supposed to walk following a horrific accident, he has done amazing. He is one of the Best HW submission fighters of all time and that alone gives a good argument for legendary status.
But Frank Shamrock I voted for less about his wins, although he has plenty of impressive wins. Rather I vote for him because he really pioneered a more modern mixed martial arts, and he has also done a lot outside of competing for the sport including organizing events, commentating, and consulting for non - ufc organizations.