I have learned that there is a pretty common understanding in some JW circles that once the court takes control that the JW parents are freed of responsibility and will often just quietly let done what needs to be done in the case of minor children. They'd rather have their kid than the notoriety of refusing blood andlosing their child to gain JW stature/martyrdom. Some more hardcores won't, but some just tell the doctor to have the court order in place so that the proper care will be given.
I am sure that this is a more sophisticated JW loophole that is not known or available to many JW families.