The Mariners’ farm system keeps giving us reasons to take their player-development success seriously. At some point, when the same organization keeps producing waves of pitching and pushing position players into national conversations, it stops feeling like a nice hot streak. It starts looking like an identity. Baseball America’s latest Top 100 update gave Seattle another receipt. Colt Emerson checked in at No. 4, Kade Anderson at No. 9, Ryan Sloan at No. 20, Lazaro Montes at No. 60 and Michael Arroyo at No. 87. That’s a loud showing for any organization. It is even louder when all five are already at Double-A or higher. The Mariners have spent the last several years building one of the more impressive player-development pipelines in baseball, especially on the pitching side. At the major league level, we have already seen what that looks like when it works.  One pitcher breaking through can be luck.…