Are you familiar with the Chad Daybell and Lori Vallow upcoming trial in Idaho? The murders of her children (among others) was hugely publicized, much like this case (tons of media + many Dateline specials, etc.). They've moved the venue to Ada County in order to find an impartial jury. That's why I think it could happen with BCK's case, too.In some States the prosecution first must try to seat a jury in the County the crime happened. This can be done with jury questionnaires and interviewing some of the jurors.
Then the defense would file a Motion as to why the make up of the jury is unfair to the defendant and ask for change of venue.
In other States, a change of venue can be granted right away without trying to sit a jury first.
Would have to research how Idaho does their change of venue.