"While Cueto was a bonus for Kansas City, he certainly wasn’t the reason they won the World Series." I'd be interested to see some data on whether the mere presence of a bona-fide ace makes a difference. I have a hunch that it does help a team, especially in a playoff series, to know they have an ace waiting on deck. The way a game is managed can be very different if you know your next 2 starters are mediocre, vs when the ace is on deck. You certainly don't wait to give the game to the bullpen when a mediocre starter is struggling in the 4th inning, when you know you've got a stopper tomorrow. Data may prove that theory completely wrong, but I'm interested in an analysis. Either way, I'd feel a lot better about the upcoming season if there was a true #1 in the rotation. Can the Twins win without one? Possibly, but the odds have to go up sharply if they get one.