It’s that time of year where we bring you an overlook of every Mariners MiLB affiliate for the upcoming season. In previous years we’ve started at the lowest levels of the system and worked our way up, but this year we’ll be starting in the high minors—the Rainiers (Triple-A) yesterday, and the Travelers (Double-A) today—and working our way down. The reason for this is twofold: first of all, MiLB Opening Day for Triple-A is Tuesday, April 5, as in today; all other leagues (except the ACL and DSL) open this Friday, April 8, so like a bunch of former honor students with senioritis, we’ll be gradually shedding A’s throughout week.