Maybe someone else has already brought this up but I noticed next year will be Jaso's first arb year. Due to all the cost cutting and this being a rebuilding year, maybe the FO has told Wedge to play Jaso as little as possible in order to keep his first year arb salary down. The less he plays, the less counting stats he racks up and the less money he will receive in an arb hearing.
The other benefit to playing Olivo is the off chance that he starts hitting and has some kind of trade value later in the season if a team gets Posey'd. If Olivo doesn't hit he can just be cut loose later in the season and then Jaso will start to play. Half a season keeps his numbers down for the arb hearing while still giving him time to earn a job in 2013. Half a season also isn't going to dramatically alter our chances of winning, especially in a year where nobody really expects us to win
Wedge is the face of this organizational decision, so he is the one who has to explain the decision. His explanations are just the only things he can think of to make the decision look good. I'm just going to convince myself to believe this unlikely scenario because I don't want to believe the alternative that our manager is really making decisions based on the garbage in you know who's article.