Vote Blade
I assume that BM was the dietician, and wanted that info out there, as he was not provoked to reveal anything. I also believe his interaction with Cyber, trying to get him to clarify why he suddenly switched on Rosie, was an attempt to see if Cyber would claim or hint at being the dietician himself, which he did not. That is why I said earlier his interaction with Cyber was either very scummy or very not. He was either scum trying to confirm that Cyber was the dietician, or he was the dietician himself seeing if Cyber would claim the role. BM is dead now, meaning he was likely not a scum role, so there is not really much nuance here as to why he would state Blade was a cannibal. Combine this with Scribble's certainty and that there was only 1 death last night it seems pretty cut and dry.
I hit Brett right in the feels.