n the accused has supenw knowledge or expertise not shared by the plaintiff, the obligation to disclose is compelling. Mann, 556 F.2d at 297 (citing Chapman v. Rivers Constr. Co., 284 Ala. 633.227 So. 2d 403.410-13 (1969)). Ellis. 409 F. Supp. at 1167-58. In order to determine whether a duty to disclose exists, we must