Why would we hear from ross again after the events of Articles of the Federation?
Why wouldn't we? It's not like he was locked away inside an asteroid. He was forced to resign from Starfleet but it's not like they made a big deal about it, not wanting to draw attention to the reasons why. As long as he doesn't open his mouth about his part in the death of the president and the cover-up by everyone else, including the current president, he's probably just as free as anyone else. What are they going to do, kill him too? The man's a war hero after all.