A bulk of openid should be in CORE. Especially the unobtrusive openid comments idea that was proposed by http://www.intertwingly.net/blog/2006/12/28/Unobtrusive-OpenID (I think).
Adding delegate and server links seems like something that should be done by a plugin or theme.
And making wordpress a server seems outside the scope of CORE. But might make a keen plugin or extension.
Ciao!