Two things can be true:
1. Diggs shied away from that hit he should have delivered
2. Dak lost this game for the Cowboys.
Dak had a lot more to process and his degree of difficulty is far greater than Diggs'? Ok, sure, I'll give you that, but Dak is the quarterback who is the engine of that offense, and he's making 40mil a year to steer this ship.
I think Dak is a great guy, but let's not deflect the blame. This loss is 90% on Dak. Team sport, sure, but when the QB is giving the ball away to the opponent and throwing behind receivers all day, how are the rest of the team supposed to overcome that?