This is your mistake. The point of a consultant is to tell the business to do what the business was already planning to do anyway. This way the consultant takes the risk/blame of the decision. It's similar to the classic 'no one was ever fired for buying IBM' "I did what the McKinsey consultant told me" is CYA. The last piece is that since everyone is in on the game, when a decision leads to bad outcomes they don't blame the consultant, but something they could not have foreseen.