Tommy's tragedy seems to be that he shows up either too early or too late. He joined the 118 too early to be part of the family that it became after Bobby started. And he met Buck too late to fill the spot that Eddie already does. And all of that has me feeling some kind of way. So, I hope he meets Josh at the wedding. And that, for once, he's in the right place at the right time to have everything he wants.
i've always kind of wondered if 5b was supposed to be leading to buddie in s6 (or even just the hintings of it more explicitly in s6). because i know part of it was eddie's ptsd arc and the fact he was at dispatch so he & buck couldn't have scenes together at work anymore, but the amount of scenes of buck in the diaz house in 5b was truly unprecedented. like he was fully enmeshed in their life and their space during that period.