You can't look at a single individual. Even as soon as you include two individuals with advantageous mutations, the chance of them having an off spring with bo

You can't look at a single individual. Even as soon as you include two individuals with advantageous mutations, the chance of them having an off spring with both is extremely higher than for an asexual organism. Scale this up to 1000 individuals, each with mutations that are advantageous or disadvantageous, which impacts their chance to have children, and run it across a few generations (with a small chance of children getting new mutations not in their parents), and the chance of a subset of the population getting many of the positive mutations is much much higher than if they were an asexual species. The asexual species will end up with more member of the final population having the single most advantageous mutation, but with none having more than that.