Shortgo about a Corsair-Gaian ally.
It's funny but that alliance have a ground, and that ground is very important and understandable.
It's money - when you want to fight your freedom fight you have to find a source of credits. Artifact trading was a good answer, also gaians and sairs are shooting same targets, so it was mutual for them.
Crete-Islay artifact route was pretty good before it was nerfed to **** and now completely useless.