I started writing lastnight on the Diaz post.
Fully behind Bat571's idea with Heredia, Aoki in CF has given too many extra outs during rallies. Break down the Minnesota series by just adding outs where Aoki failed to get balls that had been outs with Martin ranging. Many lengthened rallies there. That's when I started telling friends I don't care if they bat. 000, Heredia or Powell should be there for a couple weeks. It's not a desire, it's a need. I like Romero but the defense in CF has been too painful this last week. Besides, Heredia was my first lower profile international FA wish that the Mariners granted.
At least they've been scoring more runs to make up for the extra runs the pitchers are giving up with Aoki in CF. Wait, maybe that's the problem in the first place. :)