Right now, it doesn't matter as much who our OC is, or even who our QB is with this Offensive Line. The Offensive Line is horrible, the only thing Hill can do is get rid of the ball quickly. Smith would probably be hurt again with this line.
There's no time to let a play develop for a pass, and there are no holes for the running backs.
A better question would be what is McKittrick was alive and still our O line coach. These guys are either underperforming based on their draft position, or Scotty made some bad picks. We have 2nd rounders for guards that let defensive lines into our backfield with little resistance.
A better O Coordinator could run some misdirection to keep the D off balance, but our prime problem is the line and we will only get as far as they can take us.