Spoiler:
an R rated movie could make Luke what we see in Blank's trilogy. His final book redeemed Luke a bit, regardless. and life isn't black and white like it always seems to be in star wars movies. I'd like to see Luke fail to do the right thing for once in a movie.
If Galen remembers his past life, and IS a clone, then it must be an essence transfer. We know it exists, since Sidious has done it, and Bane knew how, and Set Harth escaped with the knowledge to do it.
What was Vader talking about in the trailer though? What purpose did he serve? If that was supposed to be the BEGINNING of TFU 2, then they have some explaining to do.