Wins Total & Winning %

If you read the rules you will see that winning percentage has nothing to do with this contest.  It is wins and wins alone.

"If multiple users are tied, the earliest start time of their last winning pick (game) will be used as the tie breaker (time as listed on the pending page). As the second tie breaker, if users remain tied, the earliest pick time that each of the contestants entered with their last winning pick will be used to determine the leader. This will be determined by a time stamp recorded when each pick is submitted."

You'll notice at the end of the contest people making picks at midnight and picking the earlier games. 

yes exactly

Tie Breakers

The race will officially end after 25 participants have reached the 100-win mark. Throughout the race, the following tie breaker will be used to rank users on the overall leaderboard in the event that multiple users are tied with a specific number of wins. If multiple users are tied, the earliest start time of their last winning pick (game) will be used as the tie breaker (time as listed on the pending page). As the second tie breaker, if users remain tied, the earliest pick time that each of the contestants entered with their last winning pick will be used to determine the leader. This will be determined by a time stamp recorded when each pick is submitted.