If you still want potg support advice allow me to shed some light. I have about 78 hours on zenyatta (i know i know) and almost all of my potg come from Shutdowns, which are surprisingly enough, easy to get if you stay back. Great thing about zen is his long range, so not being with the group is the way to go. Keep an eye on stationary ult characters (Pharah, reinhardt, reaper, etc.) you can tell when they’re about to ult if they get closer than usual. Keep wailing and the shutdown potg is yours