Wish you well on your brisket. Hard to beat those from Costco. Show us the end product please.
I've heard it said the northeast gets hosed when it comes to prime meats at Costco. Don't know if that's true.
Use your pellet grill to cook/smoke. Sear on gas or charcoal. No pellet grill will do it as well. My gas grill is my "searing station".