I cut the Sox some slack there. Sale has been nothing but frustrating for the last 4 seasons, and his inability to stay on the field was costly enough that it probably made him difficult to replace. (Becoming cheap bastards didn’t help either.)
Not sure how much potential the Braves saw in Sale. They did, after all, have the Sox take on the bulk of the financial risk, which, if they knew they were getting 2017 Sale, was definitely a way to jeopardize that deal. And as it looks like Sale wanted an extension as a condition to approve the trade, Atlanta obliged but used the opportunity to lower his AAV in the process.
I think Atlanta is equally happy and surprised with how this has all panned out…