If you don't believe that a lot can change in a short period of time think about the Toronto Blue Jays rotation at the start of 2012 Spring Training.
Ricky Romero was scheduled to be the Blue Jays Opening Day starter. The most innings Brandon Morrow had thrown in a season was 179.1 in 2011. 2012 was going to be just his second time starting for a full season. He was also a lock to be the Blue Jays number 2 starter. It's safe to say the Blue Jays weren't "all in" trying to compete.
The rest of the Blue Jays 3 rotation spots were going to be decided by a Spring Training competition between Henderson Alvarez, Brett Cecil, Kyle Drabek and Dustin McGowan. The hope was that all those pitchers would get a chance to start in 2012 and provide enough quality innings to contend for a playoff spot in 2012. It would also give the Blue Jays a chance to see who's worth keeping in the rotation for 2013.
McGowan inevitably got injured during Spring Training so the competition was done.
Brett Cecil got rocked hard in his last few spring training games so the Blue Jays decided to send him to the minors to start the season. Joel Carreno replaced Cecil for one big league start and then was sent back to the minors.
Failed Rotation Plan Blessing In Disguise?
Jays Journal | Jan 21