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First off, to be considered "homegrown," a player must have been drafted by an organization or signed by it as an amateur free agent.
As such, it should be noted that no foreign-born players who competed professionally in Japan, Cuba or Korea were included on this list. That means guys like Yu Darvish, Yasiel Puig, Aroldis Chapman, Yoenis Cespedes, Hyun-Jin Ryu, Hisashi Iwakuma, Masahiro Tanaka, Wei-Yin Chen, Alexei Ramirez, Leonys Martin and Dayan Viciedo won't be included.
At the start of each slide is a chart listing all of the team's "Notable Homegrown Players" with the round and year they were drafted (or AFA if they were signed as an amateur free agent) and their career WAR entering the season according to Baseball-Reference.
Below that, I have given a breakdown of how many of the projected eight (or nine in the AL) everyday position players are homegrown, how many projected starting pitchers are homegrown and then how many of the projected 25-man roster are homegrown.
All projections for that were taken from MLBDepthCharts as far as how the Opening Day rosters shape up, so it should be noted that my opinion did not factor in there.
As far as where teams are ranked, the total number of players set to make the 25-man roster is where I started. Then I looked at how many of them were everyday position players or starting pitchers. Finally, superstar players trumped overall quantity in determining where teams fell.
For instance, the Blue Jays have seven homegrown players projected to break camp with the team, but Casey Janssen and Adam Lind are the best of the bunch, and five of the seven were relievers or bench players.
Meanwhile, the Arizona Diamondbacks are ranked higher despite having only six expected to be on the Opening Day roster, because one of them is Paul Goldschmidt and five of the six are everyday players or starting pitchers.
I've included a look at any homegrown prospects that rank in the top 50 league-wide, according to Jonathan Mayo of MLB.com. These players did not factor into the rankings, though, as they have not yet proven themselves at the big league level.
Hopefully that helps us avoid any confusion—now on with the rankings.