Though Daric Barton (shoulder) is eligible to be activated from the disabled list Sunday, Athletics manager Bob Melvin has indicated the first baseman will remain on his rehab assignment for now. The A's have used both Brandon Allen and Kila Ka'aihue at first base early on and appear content with those two for the time being. Barton should be nearly ready physically, but he's no lock to win his job back anytime soon.