I agree that on paper, both defensively, and offensively, they are close.
Where Headly is an upgrade - in MY opinion - is the stats that chicks dig, like HRs, RBIs, stolen bases, age, and height.
Headly would be an upgrade - especially over the STUPID platoon of Callaspo & Izturis. ( Where neither one of them gets proper playing time, because of Scioscia's numbskull penchant for trying - Unsuccessfully, I must add - to keep each of them "fresh".)
As long as either one of Callaspo or Izturis is also traded - not necessarily for Headly, but more likely for relief help - than Headly should be a welcome compliment to the team.
Edited 6/26/12 by RMunkee