This year, Deloitte widened the gap between itself and competitors in the human resources space. It gained nearly two points in the 2021 Consulting50 survey. Coupled with Mercer losing nearly three points, there are now 7 points separating the firms. On top o that, Willis Towers Watson and McKinsey each lost nearly 2 points in the survey. The biggest loser, however, was Aon Hewitt. Last year's #3, the firm suffered a jaw-dropping 9.5 point decline in one year alone.