Answer to your question and the brief timeline for my GD applica

No, that is not a transfer case. My case is always in NSC. Brief timeline for my applications/petitions are following:

NIW 140 RD 07/2005
EB1a 140 RD 07/2005
I-485 (linked to NIW140) RD 07/2005
EAD and AP RD 07/2005
EAD and AP AD 09/2005
NIW AD 09/2005
First finger print 09/2005
EB1a 140 AD 10/2005
Second EAD and AP RD 05/2006
Second EAD and AP AD 06/2006
relink my I-485 to my EB1a: 08/2006
Received the answer for the first inquiry of my pending I-485 from USCIS: Name Check, 09/2006
Received the answer for the second inquiry of my pending I-485 from USCIS: Name check cleared 11/2006
Second finger print: 01/2007
Contact a congressman and a senator for help: 01/2007
Several feedbacks from the congressman's office and the senator's office in 02/2007 and 03/2007
03/28/2007 morning: a call from senator's office: card is ordered.
03/28/2007 afternoon: received welcome notice