I looked at pitchers' results and worked from there. I only used my pitchers because I know their usage, defense, etc, etc. With pitching, there are a lot of moving parts. That's why I had to look at 2P, 3P and 4P pitchers with different eyes. Then broke them down into RP/SP.
As for undeveloped pitchers, I only use it to help me determine who should be on my staff. I'm unconcerned with where they'll be in 2-3 seasons. They'll get their minor league innings and we'll see where they are when they get there.