User blog comment:FairyRaven/Fairy Tail Chapter 437: Magnolia, Review and Commentary/@comment-24277053-20150525123257/@comment-7418318-20150525213401

Actually it is. It was never mentioned anywhere that it absolutely had to be the masters to attend the meetings, only that it was common practice. For all we know a guild could have sent another representetive... or no one at all.

And that is assuming the regular meetings are still held like they used to be. Don't forget that the old magic council was completely wiped out. It's quite possible that the Wizard Saints are doing some or even many things differently than the old MC.