Interesting - Wiki has 91k too
WWE pads numbers for Mania all the time too
I am guessing that Dana is going by the 71k
I'm pretty sure Dana is discounting the 91k figure as a "MMA event" because it was a joint event with Pride and K-1. IE, it's a combat sports event, but part of the card was kick boxing so it's not the highest drawing "MMA event".
It would be like putting GGG on a UFC card and saying it was the highest drawing MMA event. Sort of true in that it HAD MMA on the card, but misleading.