Doesn't matter how many top 20 players played. The field was 18! Thats a far cry from 156. With a regular tour event there would be about 88% more opportunity for a PGA tour golfer to compete against you.
Golf rankings really puzzle me. I mean, take Tiger. It took him no time to reach the top.... but it took over a year of loosing to drop from the top..... and then he plummetted. I think their rating system is screwed up.