Never forget Filoni is a true George Lucas-padawan, George gave him most of the stories and he always says that he sticks to what George gives him.
George gave him that Mortis-guards aspect of the force, and I think it's GENIUS how Filoni waited until Disney ended Rebels to bring that storyline back and also bring back Ahsoka. To me that, plus all the voices from the OG movies/prequels, was a giant tribute to George in this 'Disney/subversion of SW tropes'-era that we're in now
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This is truly breaking new ground WITHIN the Star Wars foundation.
Dave Filoni on Kanan's future and how George Lucas and Tolkien impact Star Wars Rebels
This interview was like last week, and all he does is gush about George.