Viking,
The system is simple really. Offers are made in CPI date order. The offers that have just been made went to those with a CPI date of about March / April 2007.
The total number of upgrade offers for Bus pilots where you didn't have to forfeit your pension: 0.
For those who hold a valid rating on both types, then LTN and NCL was included in the list of offers. If a LTN FO had a senior enough position, then I'm sure that they would have been offered the base. Just because a LTN FO is current on the 737, does not mean he can jump the queue.