So, if for 4 years straight a coach starts a QB who is not even good, do you really want to say that the only problem is with the qb? I think your premise is a little shaky. What about a coach who would put him out there for 4 years if that were the case?
Although I remain disappointed in how Frost left UCF, I still think Frost is a good coach and, as such, and as a former championship quarterback, he knows a good quarterback when he sees one, and that's why he stuck with Martinez for 4 years. If you want to disagree with that go right ahead but I think you are digging an even deeper hole with the argument that Frost kept a bad QB on the field for 4 years.