Hey ED, please, PLEASE don't make it in a way the aircraft will share the same slots.
Sure slots are a limited commodity in MP servers, but this would WRECK the MP server owner's ability to restrict the usage of FC-level aircraft in order to achieve game balance.
If someone can join a slot for say a F/A-18C whether they have the full fidelity module or the FC version, we're gonna run even deeper into the same balancing issues we have now with F-15s and the lack of redfor clicky modules.
So, don't do that. Do keep the different versions in different slots.
I for myself could even buy FC4 like I did buy FC3, if they were different aircraft. But if I buy FC4, why would I buy the full fidelity versions later, unless I really, really want the FF aircraft?
And as all I play DCS in is multiplayer... If multiplayer is less fun because it gets less attention from ED, and is made even worse because of balancing issues, I'm not gonna play DCS or buy any more modules, FC3 level or not.
Off topic, but SC's business model of selling ships based off hype, not keeping their promises regarding "never selling these same ships again" etc etc. isn't any different of where ED is going now, apparently ("no more FC3 level aircraft").