It all sounds good. I mean, it's still very early days, and if you think about what's happened for both of them in the last few weeks (baby: less than a week he was with his family, now' he's living with a completely new boy with two others next door; rescue: was with his family not that long ago, then on his own and poorly for a few weeks, then with neighbours, and now with a cage-mate) it's got to have been pretty traumatic for both of them, even if the outcome is positively. They're still, both, finding their paws. And the fact they're sleeping together is wonderful, especially for your wee rescue, who must have been missing company so very much. That's put a huge smile on my face!
FWIW The boar trio I had (brothers) spent much of the first few weeks rumblestrutting and humping each other, but after that I don't think I ever saw such behaviour again from them. No dominance, just three happy boys. So I'm sure you'll get there soon.
As for my lot, they're doing well. Blaise is still very nervy around me, even with food, though there has been once or twice when she's appeared and stayed within inches of me, munching, but as soon as I breathe she's away. Bizarrely, though, if I'm in the kitchen with them she's the one willing to run across my lap, whereas Felicity keeps well away! I was getting worried about Hazel, but I think it's just that the contrast between her and the babies makes her seem so much slower and older. She's fine, really. Let's the wee ones get on with expending energy whilst she munches! She was impressed Blaise brought her a couple of leaves one day: B had picked one up then backed into a corner to eat it, which inadvertently meant the leaf was just in front of H's mouth. What's a starving, lazy pig to do other than eat it? B put up a bit of a fight the second time, to no avail, so after that decided to take her chances in the open, much to H's dismay!
So yeah, all good here (except for poor, wee Blaise!!)