The MadBum performance in many ways validates the Cespedes-Lester trade. I'd say the A's mistake was pulling Lester too early in the Wild Card game - not making the trade to get him (as sad as it was to see Cespedes go - which was very sad). There's no substitute for a mega-ace in the playoffs, see MadBum.
Had the A's won that WC game - I believe it would have been a Bay Bridge series (Lester, Shark, Gray - solid playoff rotation) - which would have been awesome. The 2014 AL WC game will go down as one of the most brutal loses, ever - for so many reasons. But so it goes, there's no crying in baseball, and there's always next year.
Congrats Giants, Go A's!