When only mgmt committee signs redevelopment agreement

Respected Laywers.

In a society redevelopment project, it’s decided that only the management committee shall sign the redevelopment agreement.

In that case what supporting documents are needed to skip rest of the members signing the agreement?

If for any dispute if members goes in court against the builder does there stand a valid contractual obligation between the member and the builder to possibly win the case by the member in such a scenario?

Thanks and regards