Well, the point I was trying to make overall was that realistically neither would have invaded the other because there was really not much of a point from either perspective. For the sake of demonstration I was assuming the Romans were invading, not that I really thought either actually would. So the fact that the Chinese did have expansionist tendencies (note that I never said they didn't, I just feel like the Romans had a more expansionist attitude; but I'm not trying to prove anything here or state that this is a fact) really doesn't change much because my post was primarily speculation about an event that I felt was extremely unlikely in the first place.