So think its possible for Garth the Greenhand to be one of the first human greenseers and the Children used him to manipulate the invaders into signing the pact on the isle of Faces? (Hope this doesn’t sound as bad as some of the other theories that you have been getting lately.)

Your theory doesn’t sound crazy at all to me…

While the clothing might suggest a link to the Green Men of the Isle of Faces, the fact that Garth Greenhand didn’t get along with the children suggests otherwise.

My crazy theory: I think Garth was a First Man shaman/king who had access to a different kind of magic than the Children, more of a flora/wood-bender to the Children’s fauna/earth/water-bending. Hence why he was considered a god.