OL injuries screw up everything.
To me, most of the offensive woes can be attributed to weak OL play. The catch-22 is that the OL can't take up too many roster spots because you need playmakers but if injuries strike your season is in jeopardy.
But still, I think the Rams felt like they had the OL covered. But even with the OL completely healthy, it's still not very good. IMO the Rams overestimated the OL and underestimated what losing Whitworth would mean. But even with a mediocre OL the Rams only lose 2 games to this point.
