Well not all keirins go that way. Sprints seem to be getting longer. Depends on grade too a little.This is to be expected. A Keirin is a sprint event where you try an do as little as posisble to the last moment and unleash top power.
But you asked me about peak numbers in points racing so I thought perhaps you were expecting something different?This is my point. I don't think any endurance rider expects to get an armchair ride in the World Points, Scratch and Madison events.
I could generate high peak numbers in a points race but my strategy may suggest that's not necessarily a good idea.