Ok, my tuppence worth...
The DNA was found in Ferida’s house meaning the person it belonged to had been there, possibly dropping off the burner phones, therefore it can’t have been John Corbett’s as we watched him bleed out following getting his throat slit in episode 5.3 then his body was found with Jackie Laverty’s in episode 5.4.
The leak re the route could have come from the armed support unit as they were in the lead and rear guard vehicles, rather than from within AC-12. What happened to the person who operated the stinger? Are they still at large? Who was the sniper and who were the gunmen in the Rangies?
Kate will be back on AC-12 team by end of next week’s episode, she knows Jo’s as corrupt as they come.