Who REALLY did it?

You heard All the stories! But each story was different... Joanna, Donnie, and Tanaman all had different stories of how pump left... But i think none of them are telling the truth! they're all best buds! wouldn't they tell one another the exact same thing?... wouldn't pump tell them? That's where everything is questioned. But what i think is, Joanna, Donnie, and Tanaman Teamed up together, and made up a plan to get rid of pump... And if what i think is TRUE... then why'd they do it?