Someone named Bill James defined #1 and #2 pitchers over a generation ago, when discussing the 1987 Twins championship season in fact. His data lead to the following conclusions: Essentially, #4 and #5 pitchers have abysmal W-L records, almost never anywhere near .500. #1 and #2 pitchers tend to have W-L records well over .500 and are where the bulk of team wins credited to the SP come from. #3 pitchers are around .500. (Bill James went on to say that the Twins pitching staff was typical in 1987 -- the only thing missing was a #3 pitcher. The other pitching roles were normal for WS champion teams). Of course, in this era we are told by some very loud people that W-L for pitchers is irrelevant. Bear in mind that I am just putting this definition out there for everyone to digest and not defending it. Nevertheless, using this definition, yes, Ervin Santana is a #1 or #2 pitcher. Probably a #2 but this year, so far, a #1. I prefer using my own stat to determine the worthiness of a starting pitcher -- the "meltdown ratio" which is the opposite of a quality start -- lasting less than 6 innings or allowing 3+ runs. Most of you will be surprised to learn that the best pitchers in the game still have "meltdowns" 40% of the time, with the worst having them 60% of the time. When the Twins picked up Santana, I ran this for him and he was at the top -- right around 40%. Take this as you will.