It's not Sanchez. Not for one year of Todd Walker. What this does is allow them to include Sanchez in a bigger deal for a pitcher or first baseman.
No, these are minor leaguer to be named later for a reason. My guess is they'll be guys who aren't protected from the Rule V draft, and thus they can't be named until after the Rule V draft.
Who is Blanco, by the way? Anyone have any info on him?