User blog comment:FairyRaven/Fairy Tail Chapter 437: Magnolia, Review and Commentary/@comment-77.194.131.252-20150525110043/@comment-1359322-20150525111933

I don't think Makarov cares whether or not the founders of FT are trained by Zeref. If he cares about something so trivial he would have disbanded the guild long ago due to it's constant complain letters from the council.