The five-man rotation is a myth.
Over the last five MLB seasons (2009 to 2013), teams have, on average, used 10 different pitchers in the starting rotation over the course of the regular season, according to Baseball-Reference (subscription required).
While flawed in its design, maybe the Colorado Rockies were on to something when, toward the end of the 2012 season, the team toyed with the idea of using a "piggyback four-man rotation," which was in essence an eight-man rotation that utilized two starters per game, as explained by the Denver Post's Troy Renck.
Despite the overwhelming need for teams to have plenty of depth in-house, both at the major league and minor league levels, there are only so many 25-man roster spots that a team can dedicate to pitching.
Sometimes other needs around the diamond arise, forcing a team to use its arsenal of live arms as trade bait in order to acquire the additional help that it needs.
Here are five teams well-equipped to do just that while not leaving themselves too thin in the rotation.
My colleague Joe Giglio recently took a look at teams with hitting depth to trade. Do you think there's a deal to be made between one the teams that appear on his list and this one? Propose your deals in the comments section below.