Their connected hands do mean that Inigo stands up virtually at the same time as Tidus. He knows the other wouldn't let go of his hand, but it's like Inigo is trying to prevent even the slightest chance of that happening all the same.

He might not be crying anymore, but his feelings still circle inside of his chest like a cyclone. He knows he still feels so vulnerable, so volatile, and he just needs to hold his bro's hand to feel like he's still got a little bit of stability in the middle of all of this. So he squeezes the hand when they're standing, making sure to hold onto it, even now it's no longer necessary to pull Inigo up.

"We can go together, right?"

Because a bro will be damned if he separates from his bro now, even if it's just because of a shower session..!!

Not afraid of a little bro nudity, right, bro.