contradiction

[Renmiri]

Actually, Yu Yevon is the creator of DZ too. He uses the fayth on gagazet to create a "perfect" Zanarkand. One untouched by war.

True. This explains why Tidus and Jecht never heard about war

i know this. but this explains why they didn't have any summoners, and why they didn't know what they were.

Can dream people summon ? Methinks not. Otherwise Bahamut could summon a "junior Bahamut" and so on. Surely a Final Aeon would be able to summon an army of small aeons if this was possible.

The very nature of Dream Zanarkand precludes the existence of Summoners IMHO. The people on Dream Zanarkand are essentially Aeons, and as such can not summon another Aeon.

This would explain Tidus and Jecht having never met a summoner, an Aeon, spheres and pyreflies. None of those where very practical to have in DZ because there was no summoner to manipulate the pyreflies, seal them into spheres, summon aeons, etc..

Actually, Tidus mentions that fiends do appear sometimes, though rarely, but it's usually a big deal when one shows up.

I think he was referring to Sin's appearance at DZ, at the beggining of X. At least I suspect Tidus had not seen fiends before Sin attacked DZ, as he didn't even own a sword or know what to do when confronted with sins scales.