What if anakin had stayed back when Mace told him to
If Anakin had stayed back when Mace told him to during the confrontation with Palpatine, it is possible that the outcome would have been different.
Without Anakin's intervention, Mace Windu would have likely been successful in defeating Palpatine and bringing an end to his Sith rule over the galaxy. This could have led to the Jedi Order's restoration and a more stable and inclusive government.
However, it is also possible that Palpatine had other plans in place and would have found another way to rise to power, even if Mace had succeeded in killing him. Moreover, Anakin's absence would have changed the course of his own story as well, and it is impossible to predict how his character development would have played out without his turn to the dark side.
Overall, if Anakin had stayed back when Mace told him to, the immediate outcome would have been different, but the long-term consequences are difficult to predict.