Excellent edit on the ROTJ briefing Possessed! That's pretty close to exactly how I'd like to see it in any edit too.
I don't like that we ever got a good resolution between Han and Lando. It was a big deal when Lando had to betray his friend, but the best we got was the cheesy "Well look at you, a general huh?" *sit-com laughter*... Therefore best to eliminate that and all the other goofiness (as you did), and let it be inferred that they already had their chat about the matter. Also glad to see the "Good luck! You're gonna need it." was removed. Not only was it interuptive, to me Han comes off as sounding like a complete dick right there.
Never minded the segment when Leia asks "I wonder who they found to pull that off?" then Nadine calls out Solo and asks about his strike team... that part still makes me chuckle at times, but I can certainly live without it since now there's a better flow to the entire scene without all of that. The tone and the seriousness of this briefing is definitely improved if only Mothma, Ackbar, and Nadine speak, as you have it.
Of course there should be a bit more fine-tuning here n there, with the hologram, music, etc, but another significant change I'd wish for is (if at all possible): Less views on the "A-team" and more on other groups of soldiers/pilots who are listening and we would (ideally) see again later.
What I loved about the ANH briefing/battle was, even if we had our main characters, the focus wasn't completely on them. We had some other interesting characters to relate to as well, which in effect also made the scale of the battle much larger.
Also, for some, I can understand if Mothma's delivery of "Many Bothans died to bring us this information" being cringe-worthy as it is, so I wouldn't mind if that part were removed, or as Ronster sugessted, scratch "Bothans". Most viewers have no clue what a Bothan is or looks like, so there's no sympathy towards them and it kind of comes off as awkwardly one-sided. But if just "Many died..." that actually makes it more relatable. Good idea Ronster.
Lastly, if possible, it would be great to have more of a formal closure, like someone saying "May the force be with you." - maybe a bit more than just that, but at the very least that much. Then of course finishing off with the droids as it is.
Again, excellent mock-up, keep it up! :)