Urias and Seager are a step above DeLeon, they traded a former first round pick in Grant Holmes who was pitching well last year when he was dealt. They don't seem totally adverse to trading prospects, but guys who they recently acquired like Buehler, or guys they think can be transformative players like Alverez and Bellinger, they don't want to give them up. As far as some of the guys they've offered up or haven't, I think they knew they'd have to be willing to give the twins something as good as DeLeon to get back a piece as valuable as Dozier, and they could be higher on Bellinger than prospect sites, plus he fits an immediate need they have. Apperently Buehler is throwing harder than he did in college, and his stuff looks really crisp.