I believe early on it was understood that both planes had a lot of similar tech that was being developed and they would borrow from each other in development. That's the way I saw the plans early on. If anyone that has been around long enough in this community they would understand that SUBJECT TO CHANGE creeps up often and shouldn't debate it, but accept it for the greater good to keeps our hobby going. We have come a looonnng way in this series and we now have access to two very popular fighters with access to systems that I never thought could/would be developed. Take a step back and let that soak in for a moment!