Skye, Shasta, Peggy, and Maevis divided up the workload for the wedding dress, then got to it as the men rushed off to finalize the treaty. Tidas had caught a detail within the document that needed to be reworded. Otherwise Marco could change the conditions pertaining to the amount of mages sent from the north.
If Tidas hadn't of caught it, then Marco could've demanded more people from the Highlands if the threat of war was eminent. Or if Alcon loss a massive amount of mages in a battle, Marco could refer to it as a dire situation, and indoctrinate twice the number of mages agreed to, or possibly more.
Not being a fool, Tidas knew that his brother had written it in such a way as to leave the treaty open to 'interpretation'. Meaning that during Marco's rein: he could indoctrinate every mage within the totality of Alcon, which technically included the Highlands. So long as he had another law or order dictating the requirement of it.
