The dagger came before the season ever started. It was a two pronged dagger.
The first prong is when Jeff Fisher decided hat he was going to hand Keenum the QB job without any meaningful competition despite saying we were a QB away and despite giving up six premium picks to move up and get Jard Goff. The damage was and continues to be compounded by Fisher's absolute refusal to hold Keenum the least bit accountable for his play on the field. He put all his eggs into the basket of getting Keenum ready for the season, and has given virtually no priority to getting Jared Goff ready to take over this team and become the franchise QB he was drafted to be. And now, while rookie QB's around the league are playing and having at least some success while getting important reps and developing for the future, Fisher stubbornly sticks to Keenum while our offense scrapes the bottom of the barrel in productivity, both in yards and points. If Jared isn't ready for any real game action at this point, that is totally, completely, unequivocally on Fisher. And if he's not, then the least he could do is give Mannion a shot, as Sean knows the offense probably as good as Keenum and definitely has a better arm.
The second was whatever was done to precipitate the decline of our run game - the one saving grace our offense had last year. I don't know what they did to the blocking scheme, but they did something and now we have on that clearly does not play to the strengths of the players we have on the roster. That's probably part Boras, part Boudreau. But at the end of the day, Boras is the OC overall and the running game coordinator as well, and our running game is atrocious. This despite having last year's rookie of the year as the primary ballcarrier. Gurley is not without fault (and I'm really wondering if the weight loss might not have hurt him), but the primary responsibility hear is on the coaches because they are the ones who have decided that it's better for guys like GRob and Saffold to do cut-blocking rather than using their best physical asset - their strength - in the run game.
It all adds up to an offense that is even worse than last year and another season is circling the drain.