Guild Leaderboard

We have a 24 hour ffa so it definitely isn't time taken. We have raided without a full guild so it can't be number of participants. We do however do massive damage and are down to a single run clear. We have been consistently top of our score every single time we move. Consistently like if we were in the top bracket. we would be number one and i have no shadow of a doubt about that statement because we are always top. So other than it being damage, what else could it be? roster development (highly unlikely) Player level??? I know we aren't the only lvl 80 guild. I'd love to know people thoughts.