Filoni was actually being failfuil to ROTJ with that The reason why Vader was so cool and detached even with little snips there was because it was Filoni's opinion even she wouldn't be able to bring any light out of Vader (Cause Anakin was so deadset on killing everyone who knew him as a good person before) It was Dave's opinion only Luke was able to do that.
Bo Katan (The last user of the darksaber) and one of the main Mandalorian characters from Clone Wars/Rebels is going to be in Mandalorian played by her original voice actress! (Starbuck from Battle Star)
https://www.slashfilm.com/the-mandalorian-season-2-bo-katan/
You can tell it's a Dave Filoni production