Honestly, as useless as Smoothie is, she never benefited the opposition side as greatly as Queen did. She is indecisive, but also never got herself embarrassed outright be it by a current top tier (like Meme) or a future top tier (like Woro). Queen literally has a convincing case to be the most underwhelming YC, especially since his bounty dwarves Katakuri's by a large margin (despite the fact that Katakuri is likely the most competent YC we've seen so far).