Even so, what about the stuff from the first series? One of the endings depicted a bloody CC in the church, and the exact same thing showed up in R2. I'm not saying Sunrise couldn't have been influenced in some way by the picture, but the way the scene was animated so specifically and featured as a major point would, I think, account for something.
Also, even if CLAMP was given "chains and wings" as themes, it's up to them how they utilize it, and I seriously doubt a group that does not only character design but ending animation as well would be filled in on at least the basics, and not let to roam wild. I mean, think about it, they'd have to have some sort of familiarization with the characters, plot points, and relationships so they wouldn't cause some sort of faux pas with the stuff depicted.
(no subject)
Also, even if CLAMP was given "chains and wings" as themes, it's up to them how they utilize it, and I seriously doubt a group that does not only character design but ending animation as well would be filled in on at least the basics, and not let to roam wild. I mean, think about it, they'd have to have some sort of familiarization with the characters, plot points, and relationships so they wouldn't cause some sort of faux pas with the stuff depicted.