The main issue was that the lines were in the way of me getting the adapter in the GP hole. They got knocked loose, and for whatever reason would drip after I ran the starter. Nothing like before where there was a fuel shower I took a bath in.If you're using a compression tester that goes into the glow plug hole, there shouldn't be any fuel coming out of the return lines. If your tester goes into the injector holes, then your return lines are open. Since the return lines are connected to the fuel filter, then I could see where the lift pump could push fuel through the filter, into the return lines and out on to the engine. This would have nothing at all to do with the injector pump.
I believe that WesPaul was correct in that it has a lot to do with the condition of my injection pump and attached components. The rebuilder's I asked seemed to think I was crazy, or didn't know how to unplug a solenoid.