Gu Fei did not ask Eternal Dominion the reason he had made a trip over to visit the Gu Family. He knew the answer without even having to ask.
Now that they were in an era where kung fu was on the decline, the various martial families or factions had to let go of the antiquated traditions of sectarianism, allowing greater movement between everyone in the community. The generation of Gu Fei's father, for example, would often meet up with other fellow practitioners and conduct forums or even organize tea parties for everyone.
Aside from these activities that involved more people, there were also often other more private exchanges and movements. Eternal Dominion's mention of his father and Gu Fei's sparring was one such instance, a meeting which allowed everybody to interact and casually exchange pointers with one another.