Although whilst part of me does want the Mako to get a med Core, your reasoning for it seems pretty shallow. It seems to be rp-based rather than balanced based. Whilst Order doesn't shoot factions other than Core and Nomads, Core is pretty much the activity carrier for most factions in the Edge Worlds so we shoot a lot of things.
I think at the least, balance wise Mako needs a med Core simply because it's as large as a med bs.