If Inigo knew that playing blitzball would require going underwater, he'd probably be a lot more freaked out about the idea.

But considering Tidus is just mentioning it in combination with swimming, Inigo is thinking of more something along the lines of water volleyball.. And that couldn't really hurt as long as he'd know how to swim, right.

Even though his current swim level is still definitely at 'being pulled along by two other guys through the water, but. But.

"Listen to Taiki, he's already getting confident! Tidus, you're rubbing off on him."