GOT theory on the faceless men of Bravos

Spoilers for books.

From the books there are children of the forest who help in the founding of Bravos. There are also a bunch of connections between them and the faceless men (weirwood door to the temple of the faceless men...).

1) the faceless men strive to become 'no one'

2) Varamyr six skins tells us warging humans is difficult - you need to force the animal ECT to submit. Cc Hodor withdraws when Bran wargs him. So you can submit to being warged.

3) the books describe loads of children of the forest in blood Ravens cave, some bound to the tree roots link him.
-- this allows you to see events like Bran Stark but also warg at a distance.

I'm thinking the faceless men are puppets for the children of the forest, that their training to be no one is to make them vessels for warging.

This ties together the two players CotF and FM whose goals have been left open ended in the book, partly because there isn't much to go on. Combined (if FM are a tool) the CotF are very active players.

CotF = Children of the forest.
FM = faceless men.

I can't remember hearing the theory around, sorry if it's a repeat.