The screenshots speaks for itself, they or he made it too obvious, protecting each other, only attacking the others, orange weakens and red finish each one of the opponents.
Didier Battala 19 (red)
Stefan the Sneaky 16 (orange)
Both master rank
I'm making a ticket so their rank is reset, but anyway the way they play I think it only takes about 10 hours of playing to reach master rank with 2 accounts.