"If we get a middle reliever and a 4th outfielder for AJ Burnett, I'd count that as a HUGE win"
It's also very unlikely.
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Why is it unlikely that a highly regarded 20 year old outfielder could "blossom" into a major league 4th outfielder? The scouting reports say that the kid has good speed and defends pretty well... which is the main trait of a 4th OF usually. And his contact skills aren't terrible. He just has no pop. If he gets stronger, he could be decent.
As for Moreno, I'm pretty sure if you stuck him in the pen right now, he wouldn't embarass us. That is, assuming he's 100% healthy.