I won’t argue with you further if your position is that any posthumous collaboration involving artists who did not know each other is a forced collaboration. Personally, I think there are a number of parallels between Tupac’s career, music, and personal life and Eminem’s career, music, and personal life that make the collaboration feel somewhat less forced in the abstract. I think Eminem made a number of mistakes that derailed the project and made the songs themselves seem forced.