Question about online battle level

[GreenGiant]

Basically I'm just wondering how some people have 99,999,999 battle xp in the online ranking. The most battle xp you can get from a mission is 150 for an SS rank. Which equals out to over half a million SS ranks to get that much battle xp. So did they cheat or are you awarded more battle xp for other modes such as predator and annihilation? Haven't been able to test it due to lower player count and I haven't been able to find anything about it online so any explanation is appreciated.

[marsHm311oW]

Ofc cheats.

[GreenGiant]

Well that sucks