What if Dooku had gone back to the light side
If Dooku had decided to go back to the light side, several things could have happened:
1. The Clone War could have ended much earlier - Dooku was a key player in the Separatist movement, and his defection could have convinced other Separatist leaders to lay down their arms.
2. Dooku could have helped defeat the Sith - As a former Sith apprentice, Dooku had access to knowledge and tactics that could have proven useful in defeating Darth Sidious.
3. Dooku could have sought redemption - If Dooku had truly turned to the light side, he may have sought to make amends for his past actions by working to bring peace and justice to the galaxy.
Overall, Dooku's defection to the light side could have had a significant impact on the course of the Clone War and the fate of the galaxy.