With low level coding cogs that might be somewhat feasible, if you have enough of them. But there are a few things that I've seen which get in the way of that kind of metric.

1. Story pointing is not granular enough, i.e. one 2-point story is not necessarily the same as the next one. Freeloaders pick off the easy ones and pace themselves to keep their 'productivity' in the acceptable range.

2. I've seen a lot of teams, especially smaller ones, evolve into a situation where each member has an area they specialize in. Then stories start getting preassigned to them. Hard to compare two coders not pulling from the same pool of work.

3. As an IC becomes more senior, a larger fraction of their work happens outside of stories, and becomes more difficult to quantify. Some of the most effective freeloaders I've witnessed were mid/senior devs who could crank out a typical story very fast and craft plausible explanations for where the rest of their time went.