Thread the marinated chicken onto the pre-soaked wooden skewers, 4 to 5 pieces per skewer. Set aside.
Drizzle the corn with the 2 tablespoons of avocado oil and rub to evenly coat.
Heat the grill over medium-high heat (350°F to 400°F). Oil the grill grates by dipping a wadded paper towel in a little oil and wiping it over the grates using tongs.
Add the corn to the hot grill and cook for 10 to 12 minutes total, turning often, until tender and slightly charred.
Place the chicken skewers on the grill and cook for 3 to 4 minutes until grill marks form. Flip the skewers and baste the grilled side with the remaining 1 cup of reserved BBQ sauce.
Continue to grill for another 3 to 4 minutes, until the chicken is cooked through (internal temperature of 165°F) and nicely caramelized on both sides.
Transfer the corn and chicken to a platter and let cool slightly.