The strong kills the weak in a jungle. But the strong and the weak co-exist at a workplace. Organizations need to identify the strong and the weak in each critical parameter and get the strong mentor the weak to improve the averages of the business in all the key performance indicators.
In the absence of a comprehensive grading & benchmarking system, organizations often to differentiate performance and identify the strong, average and weak in all the important parameters across functions and hierarchies.
Further without internal and external benchmarking of people and business units, an organization doesn't know where they stand vis-a-vis the industry.
Use internal benchmarking to identify the best & strong, mentor the weak to raise the bar and reach the benchmark.