Although I don't fully agree with what the other guy's saying, the bounties don't really change what actually happened in the fight.
I mean yeah, I don't think the two are admiral level either
But the whole "Kid and Law are YC level fighters" is just pure garbage on so many different levels. Even with plot armor, YCs simply cannot fight Big Mom as long as Kid and Law did.
Queen couldn't even stand up to DF-less, haki-less big mom.
This narrative is further exemplified by Kaido 1 shotting Luffy in act 1, Ryokugyu neg diffing king and queen, and a ton of examples from marineford.
I don't think bounties are a 100% way to scale characters. But when Kid and Law's bounties are over twice as large as the people who are supposedly on their level, it just doesn't make sense.