I think the idea he has emotionally abused dd is too much for him to think about but I'm sure it'll come out when he gets therapy.
Why is this a 'when'? He doesn't want to get therapy. He's already made it clear to you he's going to avoid getting therapy. And you know, you know, that if he doesn't want to get therapy then he'll get nothing out of it even on the slim chance he does go along to a session or two to placate you. (And a session or two is all it would be, before he writes off the therapist as "s/he doesn't understand me.")
Also, he still isn't putting her needs above his wants. You know he isn't. You're happy because he's doing more with her now and spending more time with her, and that's good as far as it goes - but look at all the things he's not doing.
Is he giving you any maintenance for her needs? No - he's spending his money on himself. And he's justifying it by saying, oh well, your family will look after her so she's fine.
Was he helping her at all when you were in hospital, when she must have felt so scared and worried? Was he spending any time with her to reassure her, or to just do the basic work of looking after her? No. And once again, justifying it by saying that your family were taking care of her so she'd be all right.
This is just what he was doing when you lived together before, when he was spending all his money on drugs, drink and scratchcards. Did she have a winter coat? No, but eh, why bother himself with that, you'd sort it out one way or the other. Was she thriving? Was she happy? No, and no, but she still didn't rank above his addiction in his mind.
He isn't putting her needs first. He isn't even acknowledging she has them.
That's a choice he has to make, or not. He's choosing not to. You can't change that for him, in the same way that four hundred Mumsnetters saying "please PLEASE don't move him in" won't make you do anything, and you'll make your own choices, you can't make him do anything just by really really hoping he does.