Why not kill the jumphole in Omicron Minor instead? It makes FAR less sense, as the reason Walker sacrificed himself was because Alaska was a "dead-end system". If they could have just flown off to Minor instead, they'd have an extra cruiser beating up the Nomads in the final mission.
The whole jumphole from Minor seems weird, given you have to follow this elaborate (and bloody near impossible) mission to get through the jumpgate on the other side of Sirius instead of flying some 20k...
Kill the other side's jumphole. And put one in that goes to Iota, the Alaska end out in a corner somewhere. That way, Nomads can still get into Alaska, LSF can still get into Alaska, but you have no reason to just barge through there.