I don't understand your question. Please expound upon your question. I mean it hasn't happened, just speculating. Carnage is above Wolverine, without a doubt. If the whole symbiote were to suffocate and engulf Red entirely, then he loses due to aforementioned reasons. Why wouldn't this be able to happen, Lance?
@Klandicar: Carnage can slice his head by cutting at his neck. Just skin there. What if the entire symbiote entered his nostrils or ears and destroyed his body from within? Carnage is faster and more agile so if he managed to slice his neck.