Thus, a disparate sentence may be warranted by differences in the codefendants' criminal records, levels of participation in the crime, or lack of character and potential for rehabilitation. People v. McCann, 348 Ill. App. 3d 328, 339 (2004); see People v. Cook, 112 Ill. App. 3d 621, 623 (1983). A "mere disparity of sentences does not, by itself, establish a violation of fundamental fairness."