There's no HUD and views of the nanosuit from the side or front all over the place in Crysis Warhead gameplay. A lot of that is straight from Crysis 1, either literally a direct rip or plausibly just with the camera detached. You also said prerender quality when a bunch of that is (again) straight Crysis 1, and a lot of the Crysis 2 stuff could definitely be done in-engine.
I never denied that there was anything from Crysis 1 being reused for continuity purposes. There are a few straight gameplay shots
from the first game, but very few. A lot of the flashback material is too polished in terms of lighting, or the fact you never saw Prophet with his helmet all the way off in the first Crysis or in Warhead, or he was never dramatically backlit on the carrier, or the C-17 interior looks a lot nicer, etc.
I played Warhead too. You got a point? You saw
other nanosuits. You didn't follow their movements that smoothly, and you had a weapon or a fist visible.
There's also the bit about how the second trailer shows actual gameplay and the first one doesn't look remotely like it. Maybe it's rendered with the ingame engine,
maybe, but it's not gameplay.