My whole post was about the reason Busquets isn't that highly rated, and the reason for that being the lack of imaginative passing he presents. On the ball in their teams, they had the same roles. However Pirlo did it with much more imagination and creativity while all Busquets really does most of the time is pass the midfielders in front of him. Defensively and what one needs to be successful is another conversation altogether. That doesn't really affect how they use the ball.
Surely you don't believe that? Its not really about whether he can hit longer passes, is more can he set moves up and Busquets has shown an inability to consistently do that. His numbers tell the story, in terms of holding mids he's behind basically all the other holding mids that reached a high level. Even a Verratti is passing better than him.
Pirlo was the best cause he saw the game quicker than others and could make a whole variety of passes on either foot with ridiculous accuracy. His mid-range passing flat to Tevez feet made Ancelotti to change his tactics immediately in the CL semi. He wasn't just switching play. He was switching play, bypassing midfields, even creating one on ones with over the top passes.