It doesnt sound to far fetched to me, there is the rumor that Abrams was offered Kennedy`s job and refused and added with the fact that Disney lost out on his future services and that Marvel are entering uncertain territory heading in to the future with the main stars no longer involved and Disney cant afford with their amount of spending to lose any ground to DC.
Yes Palpatine uses lightning in ROTJ and in TLJ Yoda uses it in a very similar fashion. Only Palpatine used it in the Lucas movies because it was his signature move, creatively it gave him something to wow over. Again, using the Lucas films in an attempt to explain off Disneys failings doesnt work, ever.
In regards to Johnson, he's proven himself to be a liar and a hypocrite. He lied about deleting 30,000 tweets after the James Gunn situation, they were deleted months before that. And he used his twitter blanket to claim there are too many white dudes making Star Wars and then continues to promote that he is making 3 more movies and then proudly says he wants in on season 2 of The Mandalorian.