i don't know about your method, but the one I would want to choose is the following:
for each weak and each category see how many managaers a particular manager has beaten.
(this should take care, of say, the 50-48 loss in runs when everyone else has scored less than 30...)
Give a man a fish and he'll eat for a day, teach a man to fish and he'll drown because you forgot to teach him to swim.
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