Well the Titan would surely stay at STN as that is where the Titan base is, it is needed there with it's QC capabilities. (Why would BLK need a QC?).
The QC's in the summer are needed at NCL (2), EDI (3), STN (1), 6 in total(CELA/O/P/R/Y/Z + ZAPZ/POWC) this means that there must be one more new mail route to come then (one at NCL-EMA and one at ?).
If BLK were due a 752 I can see them getting a Futura 734, BFS is one base for one of them I understand.