Relief pitchers in most cases are the left-overs. In general, teams put their priority players in the starting pitcher spots and if you are not a priority player you are usually a reliever. This often changes in AA or AAA where players need to change roles in order to succeed. Some players have bullpen roles due to an unusual delivery, Danny Farquhar, or due to being injury prone, Alan Farina. As the Jays accumulate pitching prospects, some good pitchers will be forced into relief roles. They can try to pitch their way out of the pen, or show their worth as a future major league reliever, or make themselves attractive to another team. There is always an opportunity on a baseball team.
Is today the greatest and most important shared birthday in major league history? No, we're not going to build an all-1/31 team here, though we certainly could, but rather, just take a look at this ....
Today's birthday produced two absolutely no-doubt-about-it slam-dumk Hall of famers in Nolan Ryan (alll-time leader in strikeouts pitched and no-hitters among other categroies, not to mention one of the most improbably successful front-office figures in recent memory) and Ernie Banks (arguably the greatest power-hitting shortstop of all time and the iconic "Mr. Cub" of one of the sport's flagship franchises) -- and oh by the way, a third Hall of Famer who might be the most important player in the sport's history, Jack Roosevelt Robinson.
That's not to mention ...
Some fans seemed to be angry, much like the Blue Jays logo of 2004 to 2011.
Darren Oliver fires away against the Blue Jays in May of 2010.
We started this series by looking at catchers and first basemen, today it's the middle infielders who we review. Because of the interchangability of shortstops and second basemen we will look at them together making it a double position look.

36 year-old Francisco Cordero was 5-3 with a 2.45 earned run average and saved 37 games with the Reds in 2011.
Fielder will reportedly play first base, while Miguel Cabrera will move (to DH or Left Field, presumably.)
1) Toronto Blue Jays: Eight B+ prospects with ridiculous depth behind them.
2) San Diego Padres: Incredible depth after the winter trades pushes this system almost to the top.
3) Texas Rangers: Continues to churn out talent, with much more percolating at the lower levels. I do not give the Rangers farm system credit for Yu Darvish. They would rank number one if I gave them credit for Darvish, but in my mind that is unfair to the other teams: I see him as a major league free agent, not a prospect.
4) Seattle Mariners: Jesus Montero plus three elite pitching prospects and others who can improve.