If one defendant responds to 25 defendants --- later on can one of the 25 defendendant represent indiivually?

Good Day.

When there is 26 defendants, one of the defendant files affidavit stating that he is filing it on behalf of all the defendants/respondents.

Plaintiffs loses the case in High court and on appeal to the bench gets favourable order.

Plaintiffs get into compromise that all suspensions and membership issue is settled and hence agrees to withdraw cases and the defendant respresenting all sign the memo of crompromise.

20 out of the 25 defendants also sign affirming the compromise.

My question is can the remaining 5 defendants get the privillage of representing themselves in the court bcos of not happy with the compromise, when all along they sailed with one defendant representing all of them? Especially when the o.s.a is over.