Here is an interesting post at MLBTradeRumors.com discussing when the Reds should call-up Chapman. There are a lot of comments, making it an interesting discussion.
Harang and Arroyo are very high-priced, Cueto is actually pitching decent in spite of his era, and Homer is out of options. Of course, Leake has been the best of the bunch so far. Do the Reds demote Harang to the bullpen? Tonight's start might answer that question one way or the other.
We saw earlier today where Dusty has not been given an extension. It looks like the only way he keeps his job is to win this year. And the only way for them to win this year (probably) is for Harang and Arroyo to turn it around. So look for Dusty to do whatever it takes to make that happen. In other words, lots of chances for Arroyo and Harang.