I think the Markakis signing pretty much eliminates any chance of extenting Justin.
The chances went from probably 2% to 1% on the extension. Wasn't going to happen regardless. What it did do is increase the chances of Justin being traded to virtually 100%.
So we turned 1 year of Heyward and 2 of Walden into 4 of Miller, 6 of Jenkins, and 4 of Markakis. Well done.