I personally didn't like how sanji finally made his decision but it was kinda cute. After all we know how much Luffy loves meat. People *****ing about Brook being able to harm prometheus need to understand what's going on. Brook is the ONLY person to ever harm him. BM is a yonko, she's been around since Roger. Her hype has been not diminished at all if Brook was the only person to harm prometheus.
It's just like people choosing to see a glass either half empty or half full..
Some might see it as Big Mom's hype being brought down..
While others might see it as something to boost up Brook's hype..
Then there's the few who look at the glass without caring about the amount of contents in it.. and just look at what the contents are exactly..
In this case, Brook's DF ability is a great DF to go up against Big Mom.. so it's not really hyping anyone up, nor is it bringing anyones hype down.. it just, is what it is.
Classic One Piece DF interactions.
