And honestly, if Giolito needs Tommy John now, that's much better than if he needs it 5 years from now. I feel like quite a few prominent pitchers had TJS at the very beginnings of their careers. Mariano Rivera tore his UCL before reaching the Yankees.
Plus this:
The chance to be in the same rotation as Stephen Strasburg and on the same team as Bryce Harper has'd to account for some sort of discount.