Yeah, Martin is a starting quality CF, at least as valuable a guy as Rusnay Castillo, who I would be batshit if they traded for a middle reliever. And they gave up something else?
The PTBNL's at this point in the offseason are borderline 40 man roster guys who might end up selected as a rule 5. So the aquiring team wants the other team to bear that risk. If the agreed player is chosen in rule 5, they'll get a different one or wait to see if he's returned in the spring. It's not going to be a major piece though.
Great trade for DiPoto.