So lemme check my understanding here: are you saying that clumping has an observed size distribution, and if dark matter were just neutrinos, there isn't a time

So lemme check my understanding here: are you saying that clumping has an observed size distribution, and if dark matter were just neutrinos, there isn't a timescale which would produce the clumping size distribution we see: if the timescale were short then we would see less small clumping than we see, if the timescale were longer then we would see more large clumping than we see? Neat.