Of course, nothing happens in a vacuum. Context changes everything. The Reds aren't just legitimate World Series contenders, they're legitimate World Series contenders with five starters other than Chapman. He would be bumping someone (presumably Mike Leake) from the starting staff should he make the rotation. Cincinnati could be fixing a rotation that isn't broken, so to speak.
This point just kills me. Evidently everything can be easily classified into "broke" or "ain't broke". Third base "ain't broke" either, but it doesn't mean having Ryan Zimmerman wouldn't be an improvement.