Actually I was thinking there had all the while been an undiscovered jump node in capella. Yes, thats right, IN the star itself. Smack in the center (ok, maybe a little to the left or right) of it. The reason we couldn't find it is because it is in the star and the star kinda masks everything else. It is a weak unstable node. Blowing up the star is the only way to get close enough to initiate jump.
It was obvious the shivians were in a hurry, hence the lack of advanced tactics and not taking over planets, but individual nodes. If they wanted to pwn us over they would have used the saths to take us down, world by world. Very cylon like. But domination, it appears, is not the goal here. They want something we have, and we are just in the way. Glassing of vasuda. Heading towards SoL. Why not kill everything along the way?
Vasuda apparently has lots of jump nodes, and maybe since we kept harassing them, killing the planet was like nuking the base. Heading to SoL, maybe there was something in SoL. Or maybe they thought since we had so much forces there, it must be what they are looking for when in reality it is just our home. The shivians seem very mobile, the concept of 'home' may be unknown to them. In fact I don't know if they are even thinking beings and not like the nomads of Freelancer.