So I know if you have a c-store version of a ship, it costs only 1 Fleet Ship module instead of 4. That said, I heard that it only counts if the C-Store variant you have is tier 5. That doesn't make sense to me.
I have wanted a tier 5 version of the tier 2 escort pretty much since I started playing. If I buy the Gladius, will a Fleet Escort Retrofit then only cost 1 module?
As far as I know, no. The Gladius is a Refit ship not a Retrofit therefore it doesn't count towards a discount. The Fleet ships that are discounted are those which you can already purchase from the Z-Store. For example, the Heavy Escort Carrier can be purchased from the Z-Store so if you buy it then the Fleet Heavy Escort Carrier will be cheaper.