If you're in super trash tier SR you can carry with Zen by hardly landing a single shot. Skirmishes break out all over the place and nothing is really organized so if you can find a skirmish going on and just harmony/discord the people involved you can swing the fight. I'm not even the best Zen in terms of aiming but if you just constantly charge up RMB and make sure your orbs are out you can rank up with the guy.