Whatever advantage in HR skills and corporate culture might help a company to hire and retain more talented employees, it's unlikely to be significant relative

Whatever advantage in HR skills and corporate culture might help a company to hire and retain more talented employees, it's unlikely to be significant relative to mostly random factors that cannot be learned or imitated: mere coincidence, good employees recommending a place to good candidates, high expectations for the company (i.e. money) or its products and services and technology (i.e. interesting work), fit between jobs and job seekers... Identifying talent that doesn't want to work for you isn't useful.