Comments, and a few Blitzball questions.

[Tavrobel]

ah so its just misdirection/backtracking.

If you don't fight enough, you could run out of Spheres.
If you go backwards, that's not a terrible thing. But it does waste time.
If you accidentally unlock something, you could be going on the wrong path.
If you attempt to teach Lulu Ultima before the end of the game, you might be wasting your time.
If you try to backtrack with Yuna enough to teach her Auto-Life, oyy geez do you need help.
And other stuff.

As I said, you'll know it when you mess up. Otherwise, just keep doing what you are doing.