I think BB has a hand like QQ or AK where he thinks 4balling just makes you fold your air and get it in with QQ+,AK which he's 40% against

I'd shove and split CO's equity because his range is wider than that
unfortunately, I can't pokerstove this because of the stack sizes, I'd have to do it separately and break it down into cases which I don't feel like doing

but BB sometimes folds his hand and sometimes he has aces/kings
good thing is your pot odds are great