The two huggers (or dual-use single hugger) works for me as a Queen thing. One Queen embryo, one standard Alien to protect the gestating Queen larva in case there is no hive present.
I remember back in the day I floated around the theory that perhaps the Runner didn't "take" any traits from the dog/ox, but rather that the Runner variant was something built specifically to protect the Queen that would have looked the same coming out of any host that was impregnated by the Queen Facehugger. 'Course Resurrection and Prometheus and Covenant all double down on the way that the host DNA mingles with the Alien DNA so that clearly isn't the case, but it was fun to think about regardless.