I would guess that this is for one of two reasons - based on the cases I've followed (also I'm an attorney but not a criminal attorney). First, given what we know as facts, it would seem bail would be difficult so the attorney is trying to get everything lined up to make the best case that BT is not a flight risk or danger to others - maybe offering GPS monitoring, home arrest, giving up passport, removing guns from the house (I've seen photos of BT and family at target practice) whatever might make the best case. The other reason is that at a bail hearing a lot of information comes out in the form of the prosecutor making the case that bail should NOT be granted. The prosecutor has to give at least enough facts to make that case. Maybe the defense attorney does not want those facts out there (fled the state in car, had/has access to guns) until he/she has figured out the "narrative" that they want to take forward. All MOO.