Dipoto is committed to surrounding the high priced guys on this team with younger cost controlled position players, i.e. Bourjos and Trumbo. I could have easily seen Reagins do what the OP suggested, and it absolutely would have been the worse move for beyond this year.
For this year only, would Kendrys be more valuable than Trumbo? At the plate, probably. Although considering we'll need Trumbo to fill in at several positions throughout the year, I think you could argue that either way.