[Dauntasa]

The problem with not using Kimahri is that there's a solo fight with him later on in the game, and while it is scaled to his level it will really fuck you over if you haven't used him at all. Oh, and have you left Besaid on the boat yet? Because what was said earlier about the dog in Besaid village was kinda misleading. It has something really important in it's mouth, and you can only get it after you're supposed to be heading to the boat to leave the island, but before you actually get on the boat. If you get on the boat, you can't get it until really late in the game when it's not nearly as useful. And no, the dialogue never gets any better.

EDIT: And if you want to learn Jecht Shot for blitzball (and if you play blitzball or plan to play blitzball, then you should), there's only one possible chance to get it. At one point, you'll end up playing a little minigame while Tidus screws around with a blitzball. Playing is mandatory, but you can fail and you don't get another chance. If you win, you get Jecht Shot, which is the second best blitzball technique, and is required for learning the best one.