A friend of mine also made an interesting observation. Ceramic bearings mainly have an effect during high rpms, right? Yet the higher tooth count make them spin fewer rpm than regular jockey wheels.
So being ceramic doesn't have much effect but the main point is the oversize wheels, which as you say, spin slower and therefore have less friction. Normal bearings or not, they are more efficient. But its just minimal and HTFU has the same effect.
A friend of mine also made an interesting observation. Ceramic bearings mainly have an effect during high rpms, right? Yet the higher tooth count make them spin fewer rpm than regular jockey wheels.