The way they measure velo now adds 1-1.5 MPH to your reading because they're taking the measurement out of the hand rather than later in flight. He's throwing his curve and changeup harder, which is fine for getting different action on those pitches, and according to that article (thanks) he's ditched his other two pitches. His fastball is exactly the same, however. I'm sure Dipoto DOES see more upside, but he didn't have to pay full freight for the upside only he sees. If you see a nice china set in a pawn shop you don't tell them how great it is and agree to pay more for it because only you know its true value.
Marco was a bad bargain. I hope he works out anyway, and that he can stay healthy and contribute more than Gallardo or Overtonm but it's a stupid deal for a player who was going to be moved to free up a 40-man spot by next year on a farm with a ton of pitching depth.
Seattle needs him to ride into the bigs with immediate success. Fingers crossed.