You would have thought that Boeing might have learned from the FSTA saga.....
TTSC offered secondhand 767s which met the RFP (or rather ISUN or somesuch); AirTanker offered new build 330s which met and exceeded the RFP.
The military customer will always prefer the solution which offers more for the same price.
Besides which, no-one else is interested in the Frankentanker, whereas the 330 has already attracted other orders.
The writing was there on the wall for all to see.....