Gase is terrible. I honestly think it's only going to get worse for the Jets before it gets better. Peyton Manning and the rest of that offense in Denver made him look like something he's surely not. All of the crap that happened this year with the handling of injuries, the way they treated players around the trade deadline, and Gase's attitude in general is going to make them very unattractive in FA also.
Garrett strikes me as a guy like Wade Phillips who can have a long career as a coordinator, but isn't really cut out to be a HC.