Possible SPOILERS!!!
I am just astonished they kept the secret - I'm a spoiler reader, I read what happened or is going to happen before watching to determine if I'm gonna watch. And I watch both NCIS-LA and NCIS and was super excited for Harm and Mac return and reading all the spoilers/info on the run-up to the show so many just figured they were still together and then the preview happened and people were tweeting their upset, and then the episode happened and they were not together. So many felt it was a ruined fantasy now, people had the opportunity to romanticize the ending of Jag and just assume they married and now they see they were not. Not want fans wanted.
Whereas NCIS and all the spoilers and run up did were only talking about all the reasons ****(for those who didn't watch) wouldn't return and then bang. And then it's great because (spoiler possibly don't continue if you don't want to know) is it a ghost or not, noise other than talking was heard (door closing - not case with Dianne). Because of the episode where Bishop finds out someone may be alive, it suggests they could be real.