So let me get this correct.
Big Mom Pirates have special bullets which can pierce Vinsmoke body and RS injuring them. Those bullets can be used by fodder.
But Queen, who's a scientist and was begging Sanji to us the RS, breaks his sword on Sanji's exoskeleton.
That is not a good look for Queen.
All this talk about Queen having an unique scientifically advanced sword is BS. There's nothing special about that sword. His strength doesn't mean anything when he has a poor quality blade. Zoro didn't break his sword against Kuma metal body.
Based on those facts one of two things is getting ready to happen. Either Queen is weaker than I thought or that just hype for Sanji before Queen start using stronger bullets/weapons.