I've looked at your other post that you linked Lilka
I honestly have not come across RAD and the attachment issue scored on a sort of continuum if I have understood what you posted. I am aware of the differing types of attachment issues that you mention, Secure, Insecure Avoidant, Insecure Ambivalent and disorganised attachment patterns. To be honest I find your explanations confusing although I am sure you know what you are talking about.
I have done courses on "attachment issues" as part of preparation groups for prospective adoptors and foster carers for many years, in collaboration with a clinical psychologist and we have never talked about attachment issues in the way you describe.
We have of course, started off with secure attachments, where the baby's needs from his earliest days and weeks are met in all aspects of his development by the birthparents, and they are attuned to his needs at all times, and thus the baby develops an "internal working model" of the world as a safe place and so long as the secure attachment pattern continues, this will be a protective factor for the child throughout the life span.
When looking at insecure attachments, we talk about the way in which even very young babies will try to find ways of keeping themselves safe although of course this isn't conscious. We give examples of frozen awareness, where a baby will keep very still in the cot or pram to try not to attract any attention from the abusing parents (It is very distressing to see this, as I have seen with a 4 month baby) and her 2 year old brother who sat quiet and still on a chair and moved in a robotic fashion when told do so by the abusing parent.
We look at avoidant and ambivalent attachment patterns and explain that the avoidant attachment pattern is set up when the parent takes little notice of the child; he is left to his own devices, where some children will be demanding and try to get attention, whereas others will keep quiet and try to find a way to get near to the parent e.g. standing by the side of the mother's chair as a way of being physically close. We talk of the ambivalent attachment pattern being where a mother/father sometimes takes notice of the child and sometimes doesn't and again children will make different "decisions" as to how they will get the attention of the parent. We make it clear that children can survive in these sorts of families because they will learn how to survive and whilst these attachment patterns are insecure, they do not mean that the child has an attachment disorder. The way we describe this is the child who lives in such chaos and with such abusing, neglectful parents, that he can't survive and is thus the most damaged child.
We explain that "love is not enough" for these children and they will carry with them the internal working model of the world that they have experienced in their pre placement experiences, and they need special care and attention. We explain that there will often be a big gap between the child's chronological age and emotional age, and the child may need "permission" to regress. The task becomes to change that internal working model and this is going to take time, understanding, and patience by the bucketload.
We also recommend books that they can read on the subject and the clinical psychologist does a lot of work with parents who are already fostering and with adoptive parents, and they do say that they can understand it more, when they actually have the child in placement.
I am wondering now if we have missed something with this notion of RAD andthe explanations that you give, which to be honest I have found difficult to understand - maybe that says more about me than the theory!!