I've always found BR to be a fair and accurate source, and as such, respect their opinion.
After all, on the surface, from an outsiders point of view, we have a first time HC, who, technically, has never even been a coordinator. We have a first time OC, coming from a team with no history of ex coaches being successful. We have a 2nd yr QB, who, regardless of the circumstances, lost a boatload of games in his rookie season. Our O-line is widely views as a dumster fire. I could go on, but that paints a fairly accurate dismal picture.
The success of our offense, IMO, hinges on overcoming those three obstacles. I may be an overly optimistic "homer", but I don't consider it to be an impossible task.
I think our coaching staff is up to the challenge. I see them as a hungry, intelligent "new breed" philosophically, while being old school, hard nosed teachers, with a low tolerence for incompetence.
Our percieved failure of a QB, failed due to circumstamces beyond his control, that had little to do with his ability. I don't believe any rookie QB in history, with the possible exception of our own #13, would have been productive, given the situation in AZ. From all appearances, he has both the physical tools, as well as the intellect to be a good signal caller in this league.
That leaves the O-line. Im not going to pretend there is a lot to be optimistic about here. Aside from LT, we have a bunch of underachieving, unproven comodities, and even in the best of cases, it will take time for them to "gel" as a unit in pass protection. I will say, a consistent running game can not only mitigate some short comings, but is a young QBs best friend. That being said, teams will likely stack the line, and force Rosen to beat them. If our coaches can scheme like I beleive, and the line can hold up just a little, we should be able to move the ball.
I know there are some big ifs there.
All I can say is "adapt and overcome".