I haven't read 'It in a couple years, but I'm reading the Tommyknockers now and I remember 'It' came out of the sky a long time ago before people. Now he made his home in Derry, but I have to wonder if he was part of the crashed spacecraft that landed in Haven which is only a short way away and a much larger hunting ground for the creature. 'The Tommyknockers' was the next novel to come out after 'It' so he had to be aware of the connection. Maybe It changed over time into what It became all those years later. I would love it if someone has read an interview with the Author that says either way because I'm not finding it in my general google searches.