Debating if a pitcher is a 1, 2, 3, 4, or 5 is completely meaningless and pointless debate. People want to quantify the starters. A 5 is replacement level. a 4 is a war under two, a three is under three, a two is under 4 and a nuber one is anything above. Everybody can now be happy with meaningless numbers,. Wether you use a 1-5 designation or a number based on a non predictive statistic, it doesn't change how good the pitcher is. It does not measure wear and tear or changing abilities due to learning how to pitch. At best you can say what was.