Exactly. And it is not only jurisdiction, the state of CO has legal custody of the baby. I think it benefits everyone to sort this out now as much as possible. The B's are stuck in CO, likely in a hotel. If they are to be permanent custodians per the court, then they can go home and settle into their new normal. There really isn't much reason for them to be in CO - if it were me, I would want to go home.
As for the F's, they must make their petitions now, while the child is in CO. I don't even understand the issues some people raise based on frothing emotionality instead of the law.