if he asks you over the phone just laugh at him. HE has no hope at all in having her moved to live with him so she can attend the same school as his SS- the SS is a compeltely different child with different environment factors and needs so of course his development is going to be different to a little girl with special needs.
For him to be able to ask a court for her to live with him he would have to prove that there is some significant reason for updating the orders since they are so fresh - then he'd have to provide evidence that uprooting a 6 yr old with special needs- who requires a routine and the ongoing support of specialists- away from her main carer who she has always lived with so that she can attend a school his SS goes to would be in anyway beneficial to her. He'd at the minimum need to prove how it woudl benefit her with Doctors and specialists reports and no specialist or educator would say that a move 8 hours away from her maincarer, school and the specialist support would be in no way of benefit to her.
Hes crazy to think it would happen- more chance of a pig flying!