Well, Uncle Meat, that's more or less what I was getting at. These Oracles come from "a line of Oracles", but they are not the same individuals we see in the Oracle titles for GBC. In fact, the existence of the "line of Oracles" suggests, as you said, that they are ancestors of the Oracle Oracles.
Of course, this may have significance outside of this game, as it is more evidence to point towards the idea that roles are always inherited through bloodline.