In a gallon size Ziploc bag or large bowl, combine chicken, 2 tablespoons olive oil, garlic, lemon juice, rosemary, 1 teaspoon salt and 1 teaspoon pepper; marinate for at least 2 hours to overnight, turning the bag occasionally. Drain the chicken from the marinade.
Heat 1 tablespoon olive oil in a cast iron grill pan over medium-high heat.* Working in batches, add chicken to the grill pan in a single layer and cook until golden brown and cooked through, reaching an internal temperature of 165 degrees F, about 4-5 minutes per side.
In a large bowl, combine kale, brussels sprouts and green onions; drizzle with remaining 3 tablespoons olive oil, vinegar, honey and Dijon. Massage until the kale starts to soften and wilt, about 1-2 minutes; season with salt and pepper, to taste. Top with chicken, pear, clementines, pomegranate, walnuts and blue cheese.