I'm also mostly encountering those 4 guys, wolfkng, d3sit, cw44, benzX . Not sure if they are bots, but I do see BenzX once in a while switching from OP earth team (his main team) to an OP water team, he almost always defaults back to earth.
Anyway, I do see the random guy once in a while as well! Not sure but I do think I've encountered your team DCU!