I thought there was a bit on this thread about how MLCers can hover near the border of two kinds of contact, or rather how the Boomerang can hover on either the border of being a Clinger, or much closer to the off-and-on. I've seen that; in the first years mine hovered on the Clinging border, still considering us his family, wanting to be with us at Christmas, etc., he then moved to the other end of the Boomerang spectrum (what led me to first of all think that he was overall an off-and-on).
He seems to have settled at that end, at least in his attitude, although he physically comes here more regularly (once a week, and doesn't seem to have as many several-week breaks as he did for a while in earlier years). Right now he's treating us/kids as an obligation, earlier years he seemed to want to come because HE wanted to be here, so emotional disconnection increasing.