Oh ye of little fayth

[Skyblade]

It's not ten years though. Ten years passed since Braska took down Sin, yes, but we never get a time for how long it takes Sin to come back.

FFX-2, however, would suggest that it's actually less than two years. If it was more than that, the majority of Spira wouldn't be likely to accept the whole "Sin never comes back" thing, since the time limit hadn't gone by yet.

So you probably have between a year, to a year and a half. And the journey is across most of Spira, it isn't safe, and it isn't fast. People might try to complete it, but some will die, plenty won't want to be summoners in the first place, and others just won't finish in time.

So we chalk it up to plot convenience that ~8 years of Sin terrorising Spira passes before we get three potential high summoners, not including Seymour. Though I guess there was that failed pilgrimage of Lulu's and whatnot, but god, seems to be a shortage of competent people out there. :/

Do you really think Dona and Isaaru would have made it the entire way?

I mean, heck, there have only been 4 High Summoners in a thousand years. Think of how many have tried and failed. Heck, we see evidence of this in the gravemarkers and piles of weapons on Gagazet. All from summoners and guardians who died.

Dona would have frozen to death before she made it across the mountain. And Isaaru would have slipped and fallen to his death.