[Marcus just nods, both as acknowledgment for the thanks (not that he thinks Tenn really needs to thank him for something he would do as a matter of course, but) and an indication for Tenn to continue. There's no judgment here, not when he could easily have tried to go to the same lengths to get Phil's medication for him]

Hey, don't be sorry-- if it means I can help protect you, then I'm glad you did. And you can go ahead and tell me anything that you think might help.

[He pauses, then adds.]

Just so you know, I'll be telling Phil all of this. I figured I might as well be honest about that up front. He's the one who's been doing the majority of the investigating and piecing together the clues on our end, so the more info I can get to him, the better.

[And it goes without saying that his trust in Phil is implicit, as is his confidence in Phil's intelligence and abilities.]