The prefix is always at the beginning of the word. "pre-" meaning before. For converged, it would be the same thing as "converge". Unless it was the suffix, which would change between both words. For converged, get rid of the 'd' so that it can't try and confuse you. Now, you have the word "converge". The prefix would be "con-" which also means "with".
Lewis thinks it is unfair that the team leaders are receiving better and higher treatment, though they haven't done the same amount of work and perspiration as the other team members.