In truth, Ryu didn't care much for interacting with the Zu Clan Ancestors. He didn't truly need them. Even without Flora's guidance, it only took him a couple weeks to comprehend [Divine Chaotic Annihilation]. And, when the time flow increase was taken into account, this boiled down to just a few days.
Though this disadvantage might pile up higher during the later stages, Ryu believed in his own talent. If it wasn't for Ailsa wanting to speak a piece of her mind, and the fact the Core Texts were all located at the center of this massive library while the outer reaches were made up of normal literature, he wouldn't even care to appear here.
Plus, Ryu and the Zu Clan would never see eye to eye. Even if he agreed to be on speaking terms with these four Ancestors, his debt of blood had already been signed with their descendants on the outside. This matter was already as good as over.