You're aggregating capabilities pretty broadly. While it might be true that a short person might be able to walk farther and get some special thing, or a small

You're aggregating capabilities pretty broadly. While it might be true that a short person might be able to walk farther and get some special thing, or a small person might be able to get into a nook and get some special thing, or a big person might be more able to carry a bunch of things back in a similar amount of time, these are complementary capabilities and no one of them is more valuable than the others independently. Even if you accept your premise that there is one dimension of capability, what is the metric, more tubers than you can eat?