Tl;dr
[b]Activision[/b] tried to assume creative control over the music, which rightfully pissed Marty off. Activision also likely assumed creative control over the story, which led to Joe leaving Bungie. Publishers do not have the right to assume creative control over a studio. Activision=Bad
[b]Bungie[/b] fired O'Donnell to shut him up after he became disgruntled and stole his shares as a final F-YOU. Bungie=Bad
It's clear Activision [i]started[/i] it, but Bungie finished it off.
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Perfect summery