If Lewis did not go into a prolonged slump he would have a little more leverage to stake a claim to one position, but he did slump and Miranda got hot.
Miranda and Lee are better defensive options at 3B right now, but Lee should be at SS over Castro everyday.
Julien is hitting better lately, but his defense is as bad or worse than Lewis'.
4 guys for 3 spots (Castro should be in CF until Buxton is back). Miranda does not play 2B and Lee, the best with the glove of the 4, should be at SS everyday. So the rotation is between 2B, 3B and DH among Lewis, Julien (who doesn't play against LHP) and Miranda (who will also get a day or 2 at 1B). Since nobody wants Farmer playing, Lewis has to agree to play 2B some days, period. Or he sits.