Analysts saw reasons to be cautious over the big events of the week, pouring cold water on Wal-Mart's plans to enter Africa through its planned acquisition of Massmart and expressing concern over Denise Morrison as the new CEO of Campbell Soup Co. The six-month war of words between Casey's General Stores and Couche-Tard seems to have ended, with the Canadian operator letting its tender offer expire. Here's the best of what was said this week.