You're falling for the assumption the brain's role is generating consciousness. It could also not do so yet still be part of an organism which is conscious. I can say that confidently because I understand how consciousness is generated. I could easily say it here and have in the past. Sure, I'll be downvoted by idiots who do not know whether I do or do not know how consciousness works, but are instead acting on their instincts and emotions. But perhaps there's at least one person in the world who is truthful enough not to have to downvote and to instead ask themselves the question of what it would take for what I assert to be true.