Deciding what to include and what to leave out has been challenging for every anime adaptation. However, Jujutsu Kaisen almost made it look easy. It provided modification where needed, effortlessly refining the manga in its weak aspects and making the title a household name, proving that, sometimes, going in a different direction is the right way.
While the manga readers became familiar with Suguru Geto before Pseudo-Geto, as Tokyo Metropolitan Curse Technical School was released before Jujutsu Kaisen, the anime chose the opposite track for all the good reasons. It showed flashbacks of Geto in various episodes, guiding the viewers to believe that the man seen plotting with cursed spirits was the same man who led The Night Parade of 100 Demons about a year ago.
However, when Jujutsu Kaisen 0 was released, the confusion about the anime Geto not being the real Geto rose from the ground as the viewers couldn't help but wonder about the extreme differences between the characters. But this very order of releases set the stage for the shocking revelations in Season 2, which only manga readers know about, for now.