You are probably trolling us, but I will give you the benefit of the doubt and answer as best I can.
Greg has six years left on his contract. SIX. There is only one reason why any coach would be extended in that situation. That's if the coach is such a hot commodity that you want to golden handcuff him as best you can. As a term of the extension, you include a prohibitive buyout clause. Granted, nothing is prohibitive these days, but you do the best you can.
Is Greg such a hot commodity that you need to apply the golden handcuffs?
That's a rhetorical question, no need to respond.