Winning changes everything. If Garrett wins consistently over the years he will be considered a good or great HC. Now, there is no doubt that there are some "Garrett Can Do No Wrong" promoters here who have seen greatness in spite of the results on the field and have been banging the Garrett drum for a long time, so much so that its been a tired old narrative which has caused most to just roll their eyes when the Red Praise Choruses are posted. And there a some who prob truly hate Red, but that in all probability is a small number of people.
The vast majority of fans and pundits have just watched what has transpired and based on watching the games feel that Garrett has not done anything special prior to this year and actually has not done as well as he should have done with the on field results prior to this season. And while the "Garrett Can Do No Wrong" crowd has a justification for every gaffe/blunder or failure most recognize its been a real problem prior to this season.
Garrett still has a lot to prove. This is only ONE year out of 4. If this team can win it all this year he will have far less to prove in the near term and will be on a super long leash. If we fold like lawn chairs in the playoffs most will prob feel that not much has changed really. What if this team goes 8-8 next year? How many that have jumped on the Process Bandwagon will be jumping off in short order?
The narrative will change with continued success, and that means winning for more than just one year. Other than that, any seeming change is just temporary and fleeting until it is shown to be a long term success story.