The adjudicator can't change the contract; he only adjudicates quarrels about the contract.
It is therefore necessary to consider the ambit of the adjudicator's powers.
The decision of the adjudicator shall be binding on both parties until the dispute is finally determined by arbitration pursuant to clause 9.5 hereof.
I am a registered Adjudicator and is also training to become a Chartered arbitrator.
If the question put is tightly circumscribed, the adjudicator, as first happened here, would be right to debar new arguments.