He absolutely hasn't had a chance to show us his competence. But the first true test will be what he does with Gase assuming this team doesn't have an epic turnaround.
A bigger concern is will the Jets really fire Gase, go out and spend huge money on a top coaching prospect, while still having to pay Gase AND Bowles their coaching salaries for next season? That's a lot of money, so contractually getting rid of Gase is pretty complicated