From my understanding, the Crawford deal would be a pretty huge salary dump. Which is likely why it won't get done.
I think this was just a case of:
Marlins: Hey, Ben, we're interested in Carl Crawford. What do you think?
Ben: Ah, I don't think so. What did you guys have in mind, though?
Marlins: Maybe Heath Bell + Hanley Ramirez for Crawford + $25mm?
Ben: No, I don't think that makes sense for us. Thanks for the call, though.
End of trade rumor.