Three problems with the methodology (and I would say this regardless of who topped the rankings).
1. Equal weight of categories. Scoring is the most important category. It's how you win games (well, that and preventing the other team from scoring but defense isn't considered here other than steals and blocks). To giving points per game equal weight to steals per game or, for some reason, minutes per game, doesn't reflect what's actually important about winning a basketball game. (Further, if Player A and Player B both average 15 ppg but Player A does it in 30 minutes per game and Player B does it in 35 mpg, Player A is more valuable.)
2. Use of rankings. Using the ranked order as a determination is weak. It gives no consideration to the space between 1 and 2 or 2 and 20. Britney Griner is first and averages 3.5 bpg. Lisa Leslie is second and averages 2.2 bpg. Candace Parker is third and average 1.9 bpg. Ranked ordered just puts them 1, 2, and 3, equally spaced.
1 could average 12 blocks per game and 2 could average 3.0 bpg while 3 averages 2.9 bpg. Ranked order sees the space between 1 and 2 and 2 and 3 as equal.
3. No accounting for efficiency. Not all 20 point games are created equally. If Player A takes 12 shots and Player B takes 24 shots and both average 20 points (assuming the same number of free throws just for the sake of the example), Player A had a MUCH better game and gave her team a much better chance to win. Missing shots is a negative for your team.
Basketball-reference.com has a
list of career leaders for win shares per 48 minutes. Cynthia Cooper is first, which, duh. Lauren Jackson and Maya are second and third. (
Here's a link to the explanation of Win Share.)