i'm personally not sure what 'real' co consciousness is. and i'd also think it's experienced different from person to person. also not sure if you are meaning more to get answers from specific people or not.

i experience a blending with mine now. it used to be more along the lines of how i have understood co consciousness, having an alter with me and knowing it, being able to talk to them at that moment, hear them, kind of like they are beside me in a way, etc. compared to where they might otherwise be more in the background, distance, etc. where i would get more just feelings from them, etc.

for me now, the blending aspect is not what i'd consider co-conscious as it has changed to where i don't know 'who' it is but can feel their feelings and other things but not be able to link it to any one specific.

as far as knowing what traumas or situations caused each one to develop, that is not anything i've ever known. i can remember some traumas but do not know when each one of the others came along. i don't expect to know that ever either as there is a lot still kept from me.