I think what Keffer saw in "A Distant Star" can be chalked up to early installment weirdness (it was only the second time we saw what hyperspace looked like at all, and the vortex the Shadow ship flies into was otherwise seen, not just later in the series but elsewhere in the same episode, as normal feature of hyperspace). Indeed, what the ship was doing in "A Distant Star" doesn't really make sense at all. Was it the same ship somehow looping back to the same starting point repeatedly, or a parade of ships jumping into hyperspace, traveling for a few seconds, then jumping out again? The unique effect could be rationalized as being a part of the ship's (or ships') odd behavior.
Pretty sure the vortex effect thing was also there in 'The Fall of Night'.
Which is what Shadow vessles exiting hyperspace looks like, no?Didn't use a jump point, though. In "A Call to Arms," it just fades into view, even as the Drakh ships escorting it use jump points.