I can't find an announcement anywhere, but on MLB's Gameday, neither the A's lineup nor their bench contains "D. Johnson", so it looks like he was in fact the loser in the decision of how to get Greg Smith onto the 40-man roster. I'm guessing Johnson was DFA'd, but we'll have to wait to find out. Hopefully the A's can still get something for him, but immobile first basemen who haven't hit much in the majors don't exactly fetch a pretty penny around baseball these days, especially when the potential trading team has already DFA'd the guy.