Why is it not just 12 picks? No matter what process you have re. qualification, you always run the risk of having players qualifying who shouldn't be in the team based on their current form heading into the match.
Just pick the best 12 players availavle at the time based on what team gives you the best chance to win the match.
Ryder Cup points is one of the few carrots that the European Tour can dangle in front of players. If the Captain had a completely free choice, he could pick twelve players that have been playing PGA Tour all year. That might be good for the team but it would be bad for the European Tour.
Rose and Poulters record this season has been very similar- but Poulter has climbed up the rankings where as Rose has been dropping - if you go by just one event then Rose would have been picked. The biggest issue was the qualification and a lot of points on the PGA meaning that Weisburger went past Lowry to get in the automatic spots - that meant a choice between Rose and Poulter