I think personally we can bring that RJ suspect list from five to four, it's possible Reede Smith could still be RJ, but I find it unlikely in the fact RJ wouldn't expose himself like he did at the end of S6, episode 4 as RJ a lot of the time sends out his associates to clean up after him or do his dirty work.

Not to mention at the end of Season 4 in the episode The Crimson Hat, RJ tells PJ that he has a good friend in the FBI, as Smith is the only FBI agent on the RJ suspect list and we know know he is an associate in his network, it would stand to reason Smith is that friend.