Yep, Dak throws to curls and hitches, because those are his easily checkdown plays - not necessarily the first choice read. When Dak's confidence is off he'll go to safe 'out' routes Against an 'average' Defense he'll get away with the short chain moving connection to Schultz, but against the 49er's of this world he just doesnt have the arsenal.
The mitigating point in Sunday's game was that with Pollard/Zeke (sharing the running load), eventually our running game would have taken ascendency as the defense tired and would have had to fill the d-line breachess.....at that point Dak would have had a chance with less coverage....as we know Pollard going down meant the running game died, 49ers were able to stay in heavy secondary coverage and the rest is history.