Thread the chicken onto the prepared wooden skewers, 4 to 5 pieces each, and set aside.
Drizzle the corn with the avocado oil and rub to evenly coat.
Heat the grill over medium-high heat (350℉ to 400℉) and oil the grill grates. (To do to this, dip a wadded paper towel in a little oil and, using tongs, wipe the oil evenly over the grates.)
When hot, add the corn and grill until tender, 10 to 12 minutes total, turning often. Place the chicken skewers on the grill and cook for 3 to 4 minutes, or until nice grill marks have formed. Flip the skewers and baste the grilled side with the reserved BBQ sauce. Continue to grill until chicken is cooked through and nice grill marks have formed on both sides, 3 to 4 minutes. Transfer the corn and the chicken to a platter and let cool slightly.
In a large bowl, combine the lettuce, green onions, tomatoes, black beans, cilantro, and basil. Add your desired amount of dressing to the salad and toss until the lettuce is well coated.
Cut the corn from the cob and add to the salad along with the diced avocado, gently tossing once more to combine.
Top with the grilled chicken skewers, serve, and enjoy!