I'll take that bet. No way, zero chance, does WotC manage to get an injunction (much less a decision) preventing Green Ronin or Goodman or anyone else from pub

I'll take that bet. No way, zero chance, does WotC manage to get an injunction (much less a decision) preventing Green Ronin or Goodman or anyone else from publishing their existing 5e-compatible content. It won't happen, period. No way is a court going to go there, for precisely the reason that it opens up the entire open source economy to ransom by cranky copyright holders. Frankly I think you're being silly here, and hiding behind a technical argument with which I never engaged. I agree, FWIW, with your definitional argument. I just don't think it's particularly relevant for exactly the reasons in the GPL link you gave.