If I had to guess...I would think they thought Yelich, Hiura, and Narvaez, etc would hit closer to the norm. This would make the defense of Wong and JBJ more valuable. Now, seeing one injured and the other fall off the face of the earth to go along with the older players looking old, well that probably wasn't expected. Edit: Also, it isn't like they didn't try to improve the offense. They did, but it just didnt pan out(Turner). I get that they tried to sign Turner but we all know that was extremely unlikely to happen so if that was the only avenue to improve the offense it was a terrible plan.