I had this crazy/awful idea that even if I were to put it up for a vote, I'd vote it down. Nevertheless, I find it a fun thought and I can't resist sharing. I guess the logic for Vader's initial arrival in a regular Star Destroyer was so that when the Emperor came later, he'd come in the Executor. Since we're changing it so Vader arrives in the Executor, what is the Emperor going to come in? Certainly not a puny regular Star Destroyer! He comes in the Eclipse! (Note that I don't care about its canonical incompleteness at this point)
Why I think it's a fun idea: it's the Emperor's ship; it's a badder ship than the Executor; I honestly like the way it looks.
Why the idea just plain sucks: this is definitely overboard with new ship designs; the ship is ridiculously powerful, with a superlaser (stupid!); as if the Rebels' odds weren't bad enough; inserting this into our edit would be a storyline/technical nightmare.
I just had to say it. If I were Catholic, I would now head to confession.