Yeah, I did forget about Ikeya. But still, the Ross 128 thing was just something I noticed - both maps show that from Ross 128, there is only one way they can get into Vasudan space.
Of course, Ikeya makes that irrelevant.
But then, I'd also want to know this: If the Shivans came into Ross 128 from somewhere other than Laramis, and they also entered by Ikeya...how the *** did they get there!? According to the canon map, there are no other (known) jump nodes to Ikeya than Ribos, and Ross 128 only goes to Laramis and Delta Serpentis.
Of course, that's part of the point...no one knows. Ah, well. I guess I'll have to have to be tortured with not knowing.
Damn Volition for leaving the story incomplete!