If anyone has any question as to how much the coaching staff respects McKensie's skills and value, understand that along with all the gadget plays they use him for (far beyond just jet sweeps), when they are down a P/KR, they go with McKensie. When they want a third RB option, they go with McKensie. And on Sunday, when they were suddenly depleted of CBs, they went with McKensie.
I want Duke out there as much as anybody. But, anyone thinking that he will supplant McKensie, or that McKensie is "useless," is not paying attention.