Don't forget that Armasight was a customer of FLIR using their cores in all their systems. If the "purpose" was to get rid of a competitor they would be better off to buy out another brand that didn't use their cores I would think? That would be better money spent in the long run since they made sales to Armasight every day which was good for FLIR Also.
To me it makes more sense to leverage FLIR's thermal core production capabilities mated with Armasights housing/systems (lower system cost no middle man). That would put the other Non-FLIR CORE systems using BAE,ULIS and soon to be DRS systems at a big dis-advantage market price wise since they still have a middle man to buy cores from then assemble systems.
Armasight combined with FLIR would mean lower production cost to build the same Zeus scope period. FLIR may keep prices same make more money same product with zero price increase for customers or they could leverage the buy to lower cost to the point their competitors feel the pain!
When you make the cores and assemble the systems under one roof you have market advantage my friends.