Hah, I just so happen to have the Yes Complete song book which has those chords in it:
Eb - Cb - Cm - Fm7 - Abm - Cm - Fm7 - Ebm - Cmaj
So they're not super fancy-pants chords, and I think they were well within Jon's wheelhouse by 1974. He most certainly could have had the progression in his head (probably having heard something like it in something by Sibelius) and might have needed someone's help to fully realize them. But I'd still put money on JA before anyone else.
Besides, if Jon couldn't have come up with that chord progression then maybe people are right to think Vangelis had a big hand in writing Olias of Sunhillow!
But if not Jon then probably Patrick (unless it was something the band carried over from the Rick days.) He shines as a fusion player on Relayer, but I'm pretty sure he had a deep grounding in traditional Western classical music as a kid.
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