If anything Gardner would have been a break even deal. Gardner is cheap, but he's literally only worth his money since he cant seem to get the OBP to make him a REALLY valuable asset. If he didnt get hurt in 2012, THAT would have been the year for him. he had quite the pace going.
If they ARE going to trade him, it's gonna be for an SP now. That's now a bit more clear to me.
They are still going to try to get Tanaka, no doubt...at that point, the only risk is the money, not other players involved. He's young, so that'd be the better move.