You don't need the traditional 1-5. 2008 -2010 did pretty well because they had guys that could occasionally pitch like aces but basically were 3 guys that pitched like either 2's or 3's in Pavano, Liriano and Baker and guys like Slowey, Blackburn and Duensing that were back of rotation guys but were better than other team;s back of rotation guys. Anything that adds up to 15 or less is desirable. Santana looks like he is in pretty good shape and was just an all star. Berrios, and Santana at #2 Romero at # 3 and May and Meijia pitching like Good 4's or ok 3's gets us there. Not that I am opposed to getting another good pitcher. I dispute the idea that you need a power #1 pitcher to do well in the playoffs. First, I don't know why a power #1 is better than a non power #1 and the Twins have beaten guys like Sale before and a #2 guy pitching well gives you a chance any game. I would love to have an ace but it is no guarantee of success and not having one is not a guarantee of failure.
2008-2010 didn't win any playoff games. It's not a good model. The corollary to the theory of "just get to the playoffs and take your chances" is to add "if you have a couple of horses," which has a modern variation of "or at least one horse and an amazing bullpen." The 2018 team will need at least one horse, which the 2008-2010 teams did not have.