To be fair, they were already there - they and the Angels have been the 2 best teams in the AL most of the season, just crush it on the run differential. It's not like Detroit is getting 2012 Verlander performances this season. Hammel has been terrible for Oakland, so Beane I think was looking to upgrade opportunistically. They got Lester at what was (for them) a pretty small price - a low OBP outfielder who they were not going to resign after 2015. Not that they won't miss Cespedes, but for a rotation anchor rental, it was a pretty fair price.