I think there's some confusion as to Osaka's technological situation. 

Osaka does not have the capabilites to produce energy weapons; as I stated, their more advanced energy arms are rare and purely salvaged items from Pre-War Japan, usually found in places like Nara, the left overs of Kyoto, Osaka proper, Tokyo, abandoned military bases and so forth. By law, they are forced to surrender these weapons to the Daimyo when found. The Samurai clans produce their own weapons, which are relegated to purely ballistics, and things like early aircraft and vehicles somewhere around WW2 in technology level. They don't have any power armor or anything like that, and probably won't reach that capability for a long time.