The problem with looking at it that way round is that a visually small angle can still mean a large discrepancy due to the distances involved. I made a quick mockup of the situation (screen shot below) and it looks like Merope and ADR GW-W d1-52 are the best part of 100 Ly away from the line between Sol and California Sector HW-W c1-7 (the axes in the screenshot are 100 Ly long). That said, I don't think there is any reason why the UAs need to be found exactly on the line. It seems pretty clear that the UAs are moving towards Sol, or at least toward the bubble:
1.2 Wings trailer: UA allegedly transported by a ship in California Sector HW-W c1-7
1.2: UAs found in convoys in the bubble, but none free-floating found there
1.3: UAs found free-floating in the Pleiades region
1.4: UAs found free-floating in the area around Aries Dark Region GW-W d1-52 and no longer found in the Pleiades region.
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