I've been keeping track, and said plot hole is addressed in the new ROTJ novelization. Its worse than you think. The book also retconned that the story C-3PO was telling the Ewoks was actually about Ahsoka, Ezra and what happened in Filoni's Rebels show despite that he's clearly talking about the Luke and his adventures in ROTJ and he shouldn't even know about that, but apparently Ezra is put on a damn fancy pedestal. As for the plot hole regarding why the jedi spirits didn't do jackshit, its explained that the reason they showed up at the ewok party was to warn Luke that they had seen the future and knew that his shit would get fucked, that Emo Ren was gonna be born and that Snoke was just their puppets, but they decided to not give him this seemingly important revelation that all three of them knew because they didn't want to make Luke sad and let him have fun at the party since it was "too heavy a burden" to actually help him. So they just fucked off permanently with Yoda coming back in TLJ because now it was a good time to start putting needless burdens on Luke...
And on a somewhat related note, in the book Bloodline, Leia is revealed as the daughter of Vader to the galaxy, which is why her reputation gets royally fucked and she loses any influence she had in the senate. Some redditors made stupid theories suggesting that the reason Vader never came back was out of shame for ruining his daughter's life with his male privilege, because he doesn't deserve the right to unfuck his family's shit.
Another explanation was given in another one of the dozens of plot hole filler guides released for TFA and TLJ, where its revealed that Snoke's magic ring is actually made from a piece of Vader's castle (the one from Rogue One and that comic with the space-time anus where Vader finds out he and Luke Palpatine's offspring) which resonates with Vader's dark side power, which some think implies that it somehow acts as a Jedi ghost repellent. I've posted about this shitty ring before and I think I went into more detail about it last time with something involving how Snoke's slippers and outfit were made from evil gold stolen from Palpatine.
Short Version:
But the simple summary of why Kenobi, Yoda and Anakin didn't help is because they didn't feel like it, despite having seen the future and knowing everything stupid that happens under Disney was known to them since the moments they died, with Kenobi knowing this shit since ANH. Way to rewrite heroic sages for the sake of preserving the non-existent consistency of your shitty films, Disney-Lucasfilm.
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Another explanation, according to rumors going about, is going to be introduced in IX where Vader's force ghost will appear as a manifestation of Anakin's dark side.
The dark side moves in mysterious ways.
www.inverse.com
Inverse isn't usually wrong, so I'm looking forward to them bastardizing Vader like they did Revan and Bane.
And for those who think JJ will ignore TLJ, he may or might not according to this interview:
www.inverse.com
ET's Ash Crossan chatted with J.J. Abrams and Katie McGrath at the 14th Annual Oscar Wilde Awards at Bad Robot on Thursday, Feb. 21. Exclusives from #ETonlin...
www.youtube.com
Take it as you will. Also IX will have some magic mcguffin that will turn the tide since that's the easiest plot device you can conceive, which I guess ties into that rumor of a jedi eater some were talking about a few pages back.
https://makingstarwars.net/2019/02/what-is-star-wars-episode-ixs-macguffin/
Plus some cringe:
The galaxy is vast and diverse, but its heroes have only ever been white men until recently.
www.inverse.com
