We have seen on X-2 that the fayth / aeons are quite helpless without a summoner, unable to prevent Shuyin from making them do his dirty deeds. Which leads me to believe that the magic the Aeons use comes from the summoner or needs a summoner to be used. This is why I don't believe there was magic in Zanarkand: there where no summoners but Yu Yevon and he was kind of in a coma, only living to summon and protect DZ.
Belgemine, Seymour and Lenne had been summoners while alive, which I believe made a big difference.
As far as Tidus smiling when he talked about Sin in DZ, it's just the way he was: a cheerful guy. Hence hated by FFVII fanboys who like their heros moody and dark
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