It's really hard to tell just through TS if someone is in eGO or not. I'd say almost impossible. If you have problems with the people in question, record some of their conversation, send it to leadership, and they'll pass down a TS ban.
The other two I have no knowledge of whether they are in Edgegamers or not, they may be his friends trying to find a place to communicate with each other. If they're causing problems, take advice from above comment.