we all thought the MS is for Berserker but check the MS ranking in the game

the top 3 are all Gamblers, Jack777, Rampage777(was on the top 1 in Jaster class during the MS event) and Redmice

I don't want to say the MS is for Berserker only but if a Berserker can't reach 35 round or even 25 round, how can they do that?