His merc is familiar with Global Spiral! Like the other mercenary groups, they're pretty well known in these circles. However, he hasn't heard of Global Spiral having any connection to Riverstone. From what he knows, Global Spiral tends to work with a corporation called Scherer Corp. He doesn't seem to have any real idea what that corporation does, though.

Jack might remember that a Morningstar agent named Gavin dug quite a bit into the mercenaries, and could be a good back up source as he pieces this together. Gaby would be a great go between for this, as she's publicly stated that she knows him!