Great discussion here. I love the idea of the Reydream including the tree and the books with a little voice echo, though think active pushing from Force Ghosts is maybe a little much.
The idea of having Maz be the holder of the location of the Resistance base is great too.
I’d hold fire on the explanation of how Maz got the lightsaber though, at least until we’ve seen Ep9. It was last seen falling from Cloud City, and with Lando returning, there’s a fairly likely chance that gives the writers a neat Lando > Maz angle.