leaving, isn't it?
What if he could be implicated in Gunwalker? Not involved, but had been told about it("See, we said we were working under the radar, and this is it! Just think of what we can do with this!")?
Could it be that, with Gunwalker blowing up in the administrations face, he decided to separate from the group so that if his knowledge came out he could try to avoid blowback on the group?
Pure speculation, but I have to wonder.