This was always the danger of relying on pass-catchers in the Chip Kelly "Blur" offense. Due to the run-centric nature and spread-it-around mentality of this team's attack, there will always be tougher weeks for the receiving options in Philadelphia. Zach Ertz, while breaking out in Week 1 and having another very good game in Week 2, has put up just three points total in the last two weeks. I also discussed the regressing nature of the Eagles' offense in this week's regression candidates column, and that quarterback Nick Foles has been fairly ineffective of late.
The athletic Ertz is normally an excellent mismatch against any defense, but the St. Louis Rams have one of the more athletic linebacking corps in the league, not to mention versatile safeties who can play as "Jack" backers and come in to defend closer. Ertz will have a tougher time than his receiver compatriots, so I expect the Eagles' passes to be more of the outside nature, testing the St. Louis corners rather than linebackers who are very good in coverage. Ertz has skill, but it won't show this week.