Why do you think that Creoles (a group that suffered far less oppression than other groups by Peninsulares) would be the group to lead the revolution against Spain?

Creoles had the most to gain, they were upset and they didn't have equal power with the true Spaniards.

Explanation:

The Creoles suffered a lot and they faced a lot of challenges during the period. As a result, they were determined and focused. They would gain a lot from leading the revolution. Although they did not have enough [powers as the Spaniards yet they were determined. With their determination and anger, they led the revolution to have the power they needed.