I failed to go to wutai in disc 2 in my game.

There were no shinra people there, yuffie didn't run off. I went up to the da-chao area but nothing happened except a few random battles (and putting out the fire with the leviathan scales things)

I was able to fight the things in teh one tower though. I sorta feel sad that I couldn't do the turtle's paradise thing (especially after I figured out how read the second flier in the return to midgar. I guess that's how you only get one shot, because by that time you can't get out of midgar until you finish the disc-_-)

I wonder though if the vehicle used to approach it makes a difference? It's very doubtful, but there's people that say you can't get the solomon ring after a point in ff8 but it's very possible right up to the end of the third disc.
I suppose someone's already tried every way to sunday already?