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The Mariners need to play carefully with depth. If you can get someone in MIF for Saunders, that can be a coup, but you can also shoot yourself in the foot bad as well (o, hai asdrubal cabrera). Not that Cabrera was traded for depth, but he was traded from what the team, at one time (for right or wrong ignored), considered a position of depth.
I don't expect Z to Bavasi something up, but behind Ackley and Saunders, the depth gets thinner in terms of impact prospects. Sometimes it might be better for the team to consider moving players around instead of actually moving them off the team (Ackley DID play 1B in College & not all players die from moving around the diamond).