I heard somewhere that in the tragedy of Karbala some of the martyrs were those who did not consider Imam Ali (a) as their first caliph and Imam. Is that true?

Battle of KarbalaMartyrdomImam Ali b. Abi TalibSunni-Shi'a
I heard somewhere that in the tragedy of Karbala some of the martyrs were those who did not consider Imam Ali (a) as their first caliph and Imam. Is that true?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 4 years ago

Some of the martyrs were like that before Karbala like Zuhair ibn al Qayn who was previously a supporter of Othman ibn Affan, but after listening and following Imam Hussain (AS), he believed fully in Ameerul Mo'mineen and Imam Hasan and Imam Husain (AS), that is why he sacrificed his life in the way of Allah under the divine leadership of Imam Husain (AS).

Wassalam.