Blood Legion are world first on that boss, yes. Due to timezones. Such a technicality would taste sour in the mouths of honest competition.
It would be like beating Usain Bolt at the 100m sprint, but only because you got one second headstart. Kind of defeats the point if you're out to prove you're the best.
If you can't beat a boss as quickly as a guild starting after you, sorry but you're not as good as they are. Still good, no doubt. But not the best.