Lance can't blame Shiro for drifting apart from the rest, not after having to see the man come to terms with literally dying and being brought back to inhabit the body of his Galran-designed clone on top of all the other trauma from before that.
Lance had morbidly noted that now two of the team had died and managed to come back to the living.
That shit's fucked.
Regardless, it's strange to see this new Shiro fade away from all of Voltron and move on to a new supporting team, even if that team must logically come with fewer bad memories and reminders of his various traumas.
He stays in closer contact with Keith than anyone else remaining on the team, but Lance sees how it eats at the two of them. Lance doesn't see as much of the impact on Shiro thanks to the distance he now keeps, but he knows it must be just as strong for him as what he sees in Keith.
There's one night after the transition when Lance and Keith are up much later than they really should be during a short off-planet mission. The others have retired to their lions for the night, leaving Keith and Lance huddled around the rapidly dwindling campfire to fight off the slight chill in the air.
It's not that Lance isn't tired, but he's not ready to go to bed. He feels like he hasn't gotten his fill of the day somehow, even if the day in question has technically ended and rolled into the early hours of the next day.
"Shiro," Keith blurts out, then pauses like he doesn't know what he was going to say, didn't realize he was going to speak in the first place. "There was…"
Lance doesn't interrupt his thought process, just lets him take all the time he needs to figure it out.
"I could feel him," Keith tries again. "From the very first time I piloted Black. It was like I could feel his soul, except I didn't understand what it was. I… God, I could've figured it out so much sooner, before everything got so much worse. We didn't have to deal with all of that."
"No way," Lance follows his instinct to argue with Keith even in this ill-advised moment. "You said it yourself, idiot. You couldn't understand what it was then."
"But I should have!" Keith tries to argue, and Lance spends the remnants of the night talking him down as the fire peters out in front of them, sliding closer and closer together to share body heat and some of his own insecurities in an attempt to even them out after Keith's unexpected display.
Lance thinks maybe he and Keith have something together after that, are building a closer friendship that could make up for the other irreversibly eroding team relationships, but…
Something in Keith snaps soon after their conversation, and Lance watches as he desperately and single-mindedly fights to rebuild his brotherhood with Shiro. Part of Lance wants to pull him close, hold him tight, whisper to him that he needs to let Shiro take the space he needs to recover, that he'll come back when he's ready.
Then his thoughts catch up to him and he realizes he'd probably be a hypocrite to say as much to someone he's trying to keep close seemingly against his will now. So he lets Keith chase after Shiro.