I hardly think that was a trade worth reversing. It may or may not have been unbalanced, but there was no clear cut evidence of collusion.
Assuming in the long run it was a very unbalanced trade, just because the manager, new or experienced, makes a bad move is no reason to undo it.
Did MLB rescind the trade when the Mets sent Scott Kazmir to the Rays for Victor Zambrano because it was one of the dumbest trades in the history of baseball? Nope, even though us Met fans wish they did...
It's just something you have to deal with and move on. Consider it a learning experience for the manager who makes the bad trade.