It can be not used as conclusive evidence since everyone is just making conjectures on gut feeling
but they all serve as a very good hint that RY allegedly renlunced US citizenship
much earlier than SYG
http://xys.cnhub.net/?keywords=%E6%94%BE%E5%BC%83%E7%BE%8E%E5%9B%BD%E5%9B%BD%E7%B1%8D&end=&span=0&author=&keytype=title&ms=0§ion=bbs