It’s been a busy offseason for the Mariners, who began restructuring their infield and outfield platoons last weekend after they acquired Danny Valencia from the Athletics. On Friday night, they confirmed a five-player deal with the Rays that sent infielder/outfielders Richie Shaffer and Taylor Motter to Seattle and first baseman Dalton Kelly and right-handers Dylan Thompson and Andrew Kittredge to Tampa Bay. Neither Shaffer nor Motter have extensive major league experience, but Mariners’ GM Jerry Dipoto appeared grateful for the depth and flexibility the pair will bring to the 2017 roster. Over two seasons with the Rays, Shaffer primarily operated as a backup first and third baseman during the …

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