Honestly, this chapter and Joel's eventual reaction at the baseball field feels long overdue. He's not even 18, and he's been through a lot in a month. He's wound so tightly fearing that everyone will figure him out, that he's just exhausted. And then the loss of #17, and the realization that while Warhawk baseball is baseball, its not Joel's comforting "home" baseball that always grounded him and given him something to define himself with at Tempton.
This entire chapter was nothing but Joel comparing old to new and being so off kilter he couldn't define himself. Yes, there were moments with Devin and even Colt that helped him relax, but he's got to do that on his own.
I also can't help thinking about Joel's reaction to the rumors about him and Lorianne. He seems to be so bothered by it that I can't help but wonder if he won't out himself in some way to end that. Or maybe even Lorianne can sense that in him, and knows he's no danger? Could be why she insisted that he join her for lunch, knowing how much Rissa chased the others away in the past.