Quote Originally Posted by Mirage
Tidus did exist though, in the same way as summoned Aeons exist. You could say Tidus actually is the same as an aeon, just not as powerful, and not aware of it himself (not until the end anyway). Also, Yuna didn't look similiar to Lenne. Shuyin was fooled by the dressphere, which projected Lenne's personality onto Yuna. I think that makes sense, as Shuyin was basically a ghost. I don't think ghosts are fooled by appearances, that's why he instead saw Lenne's 'spirit'.
Good catch! Shuyin's being fooled by the ressemblance never really sounded too credible to me.

Agree 100%, Tidus and DZ are basically Aeons