It's all a bit of a mess really.
He begins with an account of the 1904 Hexham wolf, then describes how a wolf was caught in Cumwinton, Cumbria, a month later. He quotes the local Hexham newspaper of the time arguing that this was not the same wolf, and then puts forward his next argument that "according to some theorists" there was whole pack of wolves roaming around Northern England by night at the time.
From this he then says how the Hexham wolf attacks abruptly stopped. He then joins the story to the Hexham Heads by saying "In 1972 however it may well have returned - albeit in a slightly different guise, and as evidence of this we have to turn our attention to the bizarre story of the Hexham Heads".
So in the space of a few short paragraphs he's thrown a number of theories into the pot, none of which have any tangible connection, and none of which contain any sources or references to follow up.