User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-78.42.186.25-20141024020543/@comment-67.1.120.162-20141025034159

Tukson was executed for daring to leave the organization, not explicitly for being a part of the "old guard". Though it does seem reasonable to assume he was leaving because he was fed up with how WF devolved into GI Joe's Cobra, basically.