The sequels them selfs leaned heavily on pre Disney content that wasn’t an after effect of them it was the plan since they made the EU legends and started picking pieces out of it.
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Sure small amendment, the reception of the prequels and the crystal skull drove him into giving up on Lucas films.
But I wouldn’t take my word on it and neither should you.
As much as I hate videos like this finding old interviews is a massive pain, at 9:20 there is abunch of interviews with Lucas and some other Starwars involved people. I’d say the rest of the video can be disregarded.