I will just quote Wikipedia https://en.wikipedia.org/wiki/Cito_Gaston "Cito Gaston managed the Toronto Blue Jays from 1989 to 1997, and again from 2008 to 2010. During this time, he managed the Blue Jays to four American League East division titles (1989, 1991, 1992 and 1993), two American League pennants (1992 and 1993) and two World Series titles (1992 and 1993)."
It is difficult (at this time) to imagine this being said about any other Blue Jays manager in the next 50 years.
I didn't actually follow the Blue Jays very closely during his first term as manager (I followed the Expos more closely), but even in his second term he was an improvement over John Gibbons: On June 20, 2008, Gaston was rehired as the manager of the Blue Jays to replace the fired John Gibbons. It was his first managerial job at the major-league level since being fired by the Blue Jays 11 years earlier—unusual for a World Series-winning manager. In his second tenure as manager, he succeeded in improving the team's record to the point that it finished over .500 after a poor start to the season under his predecessor, John Gibbons, that had the team in last place at the time of his rehiring. When Gibbons was fired, the team's record was 35–39; after Gaston and his coaching staff took over, the team earned a record of 51–37 for the remainder of the season which included a late ten-game winning streak and the Blue Jays finishing fourth in the American League East. (from Wikipedia). I followed the Blue Jays during his second term as a manager and he seemed to be doing a good job.