I think it's like when you have a human corpse with his wrists crossed on top of the chest. Sure, not all or,actually, hardly any people are buried with that pose. It'd still be weird if you always drew people sleeping like that.

True, but if it's natural looking then we can give it the benefit of the doubt and assume it's alive. The dead looking pose doesn't happen naturally, it's arranged like that by humans, and that's only possible if the butterfly is dead.

I'm pretty sure none of them naturally die in that pose; its an artificial death pose rendered for the sake of identification