Per Roster Resource, which admittedly is not official, their infield features Raley/Garver at 1b, Dylan Moore at 3b, and some guy named Ryan Bliss at 2b. I’m not sure Chase Meidroth is an upgrade. Meidroth strikes me as the type of player most teams already have, and the Mariners do have better infield prospects they can use. Yoshida might be an upgrade at DH over Haniger, but only in the durability department, and that’s compromised by his recent surgery. Plus is he really a draw for Asian fans? He’s not Ichiro, Shohei, Darvish or even Daisuke when it comes to being a Japanese icon.
Abreu is an upgrade over Robles, as Mariner fans are more likely to see why the Nats let him go then see him continue the pace he set in Seattle. But does that upgrade make this deal worth it when it ignores their weak infield?