I what Zargabaath said is dead on. There's no evidence to suggestion that Jecht is modeled on Shuyin's parents although it seems highly likely and there is no evidence to say otherwise.
Another theory though is that if the war between Bevelle and Zanarkand was the true end of Zanarkand and that Zanrkand used Summoners as their main line of defence such as Lenne, why doesn't Tidus know who the Summoners were. So it would suggest that the Fayth didn't create a fully accurate version of the original Zanarkand, so perhaps it was "their version of a utopian Zanarkand" which would make sense as it was their "dream" and dreams are never completely accurate, just an expression of subconscious thoughts breaking a conscious mental barrier whist in an unconscious physical state (try say that ten times fast).
I think it's a clear suggestion though that Tidus' Zanarkand is NOT identical to Shuyin's Zanarkand. That and the obvious fact that they don't have the same names, just similar backgrounds like being Bliztball players, which would logically give reason as to why Shuyin was a Bliztball player, he was inspired by his father.
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