That's true but remember that Capcom did the combat and that provably means that they shaped the combat and moves even if it was indirectly.Forgetting the part where they take mostly all of the movelist from Nero. If anything, you could argue they only played 4, if you were to go by the combat.
In retrospective I do think that they provably have played 4, even if it was just to do research, but I get the impression that they've never played 1.