Peter Cambor is slowly leaving NCIS:LA?

?

I have notice from the last two episodes now that Nate Getz (played by Peter Cambor) is doing some secret trainings with Heddy's permission. And on episode 3, Nate decided to go overseas (to an assumed Middle Eastern country) on a special assignment to which we can expect on the upcoming episodes. 

However there are no report of Cambor really leaving the show...Yet. My speculation is that they might add Mike Renko back (played by Brian Avers) as a permanent cast to add more "action" to the show or it's a possible storyline surrounding Nate Getz. 

The sight of having another main cast leaving the show might give the fans a very depressing mood since not all has gone over the loss of agent Dominic Vale (played by Adam Jamal Craig).