ForestHillier and Ex FH Pat look more like the same person than connected people because they have an identical writing style, including never using punctuation marks at the end of sentences (as far as I can see).
But perhaps they are just friends, and this shared habit the basis of their alliance?
My guess is that his/her/their real name is Pat, and Ex FH Pat means 'Former ForestHillier', with an amusing overtone of 'expat'.
I agree with Cellar Door that it is all thoroughly intruiging. Is this the point of socketpuppetry, Pat(s), to get everyone talking about you?