I don't think anyone has a clue beyond wild speculation.
So I treat them as a non-issue. They either have given up on their shares, or they are just letting the process go through.
There has been plenty of opportunity for them to stand up -- clearly the most obvious would have been an easy seat on the EC... but they declined and disappeared.
I treat them as disappeared, and don't speculate much into why. Because, any of the speculation I've seen involves such quantum physics that I don't understand.