Like this, Tidus doesn't need anything else. With a body beside him and a familiarity, faint as it is, that he'll never get from the real source - Tidus sinks himself into it, lets nothing else come through. Not from him, at least. He listens out for Inigo, not about to ignore the other man; but he doesn't have to exert any extra effort with him right there, ready to hear anything he needs.

But being this content, and with a body easy to fall into slumber with the spirits he's been in lately -- Tidus succumbs, nothing but the sounds of his breathing an answer to Inigo.