There's a but in that thanks, or so Tidus thinks he can hear. Of course there would be, especially when he's making so clear that he doesn't know anything. But when Taiki gives him that opening (or really, even if he hadn't-), he tries and take his chance.

"How about if I ask? For you. If you told me some more about what you normally do with a bond, and I found anyone onboard who knows about them. Just to see." So Taiki doesn't have to go through it all himself. But Tidus realises his voice has picked up in the hurry to not be dismissed, remembers to settle his energy.

"I just think... even if you don't have an answer now or a solution--you don't have to give up. There's always something that can be done."

He smiles with confident at Taiki, with belief. And he does believe it, whether or not they don't know where trying will lead them. But you'll never know without doing it.