Adjudication of development agreement

We are Apartment Owner in old apartment consisting of 6 members. 1. One of the members has not signed Development Agreement. Now the DA has to be given for adjudication. Can the DA be adjudicated if one member has not signed the Development Agreement? 2. The DA has a clause that any 1 member cannot cancel the DA. Can the DA be adjudicated on the basis of this clause with signature of 5 members. 3. DA being registered agreement, is it necessary that all members should sign the DA before adjudication or members can sign the DA at the time of registration / execution at Registrar's office. 4. There is a resolution passed by majority resolving that President and Secretary are authorized to sign the DA and any other document on behalf of condominium. Can the DA be adjudicated on this basis?