How to say 'Goodbye'

I always imagine that Gibbs wants to say something to Jen in autopsy, but struggles to find the right words, and that maybe he returns later on his own to try once more. This is my interpretation of some of the reasons he finds it hard, and on what might have happened if he went back one last time. Sort of Jibbs-y, insofar as that's possible with her dead. Canon character death.