Following up on the Seattle Mariners minor league system's pitching, here is the Mariners minor league EMERA for all eligible pitchers* based on season pitching totals current as of yesterday. Pitchers are broken down by tiers: Ignoring all other developmental concerns, you could hypothetically slot the 1st tier in AAA, the 2nd tier in AA, the 3rd tier in High A and the 4th tier in Low A. On a more relevant scale, you want AAA pitchers in the 1st tier, not the 2nd tier or below... and you expect single A pitchers in the 3rd or 4th tier, so they're doing well if slotted higher.
And of course, EMERA is designed to estimate a pitcher's potential MLB ERA, so if his EMERA looks like a decent MLB ERA, that pitcher theoretically could pitch in the bigs right now.
(Ryan Feierabend is currently pitching in AAA and has enough innings to qualify, but I included his High A totals in parentheses as a point of comparative reference, as he has enough innings at that level to qualify as well.)
* - Minimum of 10 IP
|Player - 1st Tier||Lvl||EMERA|
|Player - 2nd Tier||Lvl||EMERA|
|Player - 3rd Tier||Lvl||EMERA|
|Player - 4th Tier||Lvl||EMERA|