Micah Sweet
Level Up & OSR Enthusiast
Building on someone else's work is collaboration, just not good faith collaboration if you're doing it without permission.That’s ahistorical. Dave ran a game for Gary. Gary requested some notes so he could run it. Dave obliged. Gary then modified those notes with little to no input from Dave and published them as D&D. Gary later went on to create AD&D with no input from or credit to Dave. Dave sued over this and won. At no time did Dave and Gary in any meaningful way collaborate. Especially not on anything for AD&D.
Of course, I don't know the history backwards and forwards, so this is assuming you are correct about how it went down.