If Lewis fight a disciplined fight, he wins easily. But how often did Lewis do that? I give the man his props, but he often made himself available to be punched by smaller guys, and look how easily the comparably sized (minus the gerth) Ray Mercer got inside on Lewis, the only difference being that I imagine Louis would know what to do when he got there. Louis comes forward in a crouch, Lewis can miss the jab and right, and Louis throws beautiful short punches with enough power to KO Lewis.
Lewis provided examples of how dominant he could be against a smaller fighter (Holyfield I, Morrison, Tua) and how careless and beatable he could be (Mercer, Rahman I, Holyfield II, Bruno, McCall I). Depends on which one shows up.