User blog comment:Ambrose4803/Gorkil the Goblin King in The Desolation of Smaug/@comment-4379631-20121221134504

and also at barry humphries IMDb page  it shows that "the great goblin" and "gorkin" are two different characters. It says that Gorkil (mispelled Gorkin) is in the second hobbit movie, The Desolation of Smaug, implying that maybe the goblins have got a new leader after the great goblin died in the first movie. It is also likely that it is just a mistake, as both the great goblin and gorkil are both played by barry humphries. but maybe it isn't.