If it's true that practice makes perfect, then the Rams offense is going to have a real challenge AND a real opportunity.
Their pass offense is going to have to practice against perhaps the best secondary in the league. And they are going to get their pocket picked a lot.
There is a real opportunity here for the Rams passing game to improve, or at least to gauge itself against the best. I imagine the coaching staff especially is well aware of this.
I have little doubt that Brown was better this year, at least in part, for having to go up against Donald regularly. He knows he won't be facing anyone better than that.