In response to softlaw2's comment:
DBacks would be willing to unload Adam Eaton, if they plan on retaining Ellsbury as a FA.
Nats would be willing to unload Brian Goodwin, if they plan on retaining Ellsbury as a FA.
Giants would be willing to unload Kyle Crick, if they plan on retaining Ellsbury as a FA.
DBacks would be willing to unload Trevor Story, if they plan on retaining Ellsbury as a FA.
Less than the top tier prospects are dubious, so any team that currently wants Ellsbury a few months to try and sell tickets and/or improve playoff prospects and plans on retaining him as a FA isn't going to cling to some bottom half BA prospect.
Due dilligence hasn't been done and isn't being done, I've seen that for a number of years. Which is why Ellsbury is still here.
What evidence do you have that "due diligence has not been done" by the Red Sox front office?
ZIPS projects a remainder-of-season on-base percentage of .325 for Jacoby Ellsbury and .367 for 24-year-old Arizona outfielder Adam Eaton, whose minor league OBP was 58 points higher than Ellsbury's minor league OBP.
The Diamondbacks are not making that trade regardless of whether Ellsbury will sign an extension.