Thor–that’s an interesting theory. So, the longer a rumor lasts, the more likely it is be true. That means if I start a rumor that you’re actually the god of thunder, trolling the internet for a fight, and I come back 10 years later to find the rumor still circulating, then I was right?
Kid, lemme explain the Internet to you. It does one thing really really well–it spreads false information. Ever get the “Walt Disney Jr” e-mail? Or one of those bogus virus warnings? No matter how much info is put out debunking this garbage, it pops up a few months later, good as new.
If you’d read Neil Gaiman’s “Don’t Panic”, you might actually learn something about the creation of the Hitch-hiker’s series. Gaiman interviewed many people that worked with Adams on the series and the books, and it seems pretty obvious that Adams created the idea, wrote the scripts (with one collaborator, not Pratchett), and wrote the novels (no collaborator).
I hope this helps you with your quest for knowledge.