The OT as the core? That I can accept, but Lucasfilm sees the PT as the core- I mean, it seems to me that the each installment of the PT is treated as its own entity while the OT is bunched up into a single installment. And also, therewas a lot of influence from the Dune books in SW. Maybe the PT was an attempt to kinda do that, explaining the politics of the universe and having a six part saga (Frank Herbert wrote six Dune books)