your point about Doug knowing everything about Krakoa actually helps give credence that it was not just Hope and Exodus acting unilaterally , he would have made a fuss if that was the case. Which means the entire council voted on this .Assuming your scenario of all the guys ganging up on poor Selene We have four possible scenarios ALL with Selene on ice.
1.Off panel It was tabled that she goes to the pit ,but Krakoa objected because it cannot hold her.
2.Off panel Krakoa personally objected to her resurrection because of Selene's infamy and so they had to put her on ice another way.
3. Krakoa can indeed hold her and this is a temporary incapacitation to prevent her from.escaping(which unlike Sabertooth she can do much easier if she knows her fate is the pit) she will be shown soon in the pit together with Sabertooth and pals
4.Sinister's 'omniscience' is at "work"