Jerry is still here. The assumption is that the coaches since Jimmy, excluding Parcells, were just weak yes men who basically were not true coaches and that Big Mike would just follow suit and be another weak HC like Garretop was.
McCarthy made some bad calls, such as pre-DC before Quinn, but I think he is a vast improvement over Garrett and has more control then it may appear, and definitely more than Garretop had.
The stomach does churn when I see Garrett on TV as an analyst, briefly, a pang of true fear erupts as the brain sees him as still our HC, then reality sets in and a deep relaxation takes hold. The decade under Garrett always seem a wasted time for Cowboys fans.