Preheat the grill to 425°F and clean the grates; pat the wings dry on paper towels.
Brush the wings with the olive oil, then season both sides with garlic powder, salt, and black pepper.
In a large bowl, whisk together the Buffalo hot sauce, melted butter, and chopped cilantro; set the sauce aside for tossing later.
Oil or spray the grill grates to prevent sticking and arrange the wings on the grill in a single layer; close the lid and grill for about 25 minutes, flipping, rotating, and spraying or brushing every 5 minutes to promote even charring.
Move wings to a cooler area of the grill or a higher grate near the end so they heat through without drying out, and continue grilling until an instant-read thermometer inserted into the thickest part (not touching bone) reads 165°F.
Transfer the hot wings to the bowl with the sauce and toss with tongs or a spoon until evenly coated.
Serve immediately with blue cheese dressing, celery sticks, and carrot sticks.