there were so many Cas related moments in regards to Jack in 13.01 but there’s one I haven’t seen mentioned.
Jack walking naked in the woods. This powerful being who is currently kind of clueless about who or what he is. Right away I thought of when Cas came back after dying in s7. We didn’t see it (😢) but Cas walked out of the water naked and Daphne found him strolling nude through the woods without a clue where he came from or who he was, but she took him in and watched out for him even though he was probably acting super bizarre. Similarly we see sheriff Barker taking Jack in (though her doing so makes a lot more sense–Daphne should have called the cops too) and simply being kind to him and trying to help him.
Both Cas and Jack hang out with their respective care-takers until angels/demons who want to use them for their power show up.
Each of them also gets their own Winchester taking a personal interest in their well being and cluing them into what’s going on.