Spread of Zaydism

The following excerpt is from this book [1] and nothing is changed at all.

Zaydi tradition holds that Zayd ibn 'Ali (d. 740), the brother of the fifth Imam (Muhammad al-Baqir) of the Twelver Shi'a, studied Mu'tazili kalam with Wasil ibn 'Ata'.

Zayd led a revolt in Kufa against the Umayyads. His following spread beyond lower Iraq in the following generations.

Zayd's followers, the Zaydiya (also called the Fivers), were politically more radical but theologically more moderate than the Imami or Ithna 'Ashari (Twelver) Shi'a from whom they separated.

Like the Khawarij, they actively led rebellions against what they perceived to be unjust (Sunni) rulers.

Yet the Zaydis were willing to acknowledge the partial legitimacy of the caliphs who led Islam before 'Ali ibn Abi Talib. 

In kalam, they eventually accepted the teachings of the Mu'tazila, especially the Bahshamiya, except on the question of the imamate where, as just indicated, they held a position between Sunni and Imami Shi'i theologians.

Reference  
[1] Martin, Richard C, Woodward, Mark R and Atmaja, Dwi S. 1997. Defenders of Reason In Islam: Mu'tazilism and Rational Theology from Medieval School to Modern Symbol. Oneworld Oxford. page 40. ISBN 978-1851681471