No doubt. But definitely should've thrown the ball away on that fumble.
And O'Connell should've went for the 4th down on the opposite end. Knowing their offensive line wasnt doing their job, you have to do something to keep yourself in the game and force the Rams to do something different, or they'll keep sending the heat.
It would've helped if Darnold would've hit his shots early, that would've also changed the way Rams played it. But he didn't, and Stafford made the most of his opportunities.
The game was over when he fumbled and they returned it for a Touchdown.
I'd say it's on the offensive line first, then OConnell, then Darnold.