2008). And "[w]hile a mandate is controlling as to matters within its compass, on the remand a lower court is free as to other issues." Sprague v. Ticonic Nat'l Bank, 307 U.S. 161, 168, 59 S. Ct. 777, 83 L. Ed. 1184 (1939). Simply put, the Brown I mandate did not apply to Rule 23(b)(3), nor could it. On remand a