I don't think the coaching staff is the problem.
There are of course other issues with the roster, but the loss of Dach really impacts the roster. With him healthy the jobs of Suzuki, caufield, Monahan, Newhook and Slafkovsky would all be easier as he makes those around him better and it's harder for opposing teams to key in on Suzuki defensively.
I'm sure we're missing the small things Savard does as well.