In truth, the 1054 schism was only official recognition granted to the fact that the two churches had long since drifted apart. The pope certainly shouldn't be able to boss the Orthodox around like they were Western Catholics (not even if the game was set to begin before 1054!). It makes perfect sense that the emperor (& the patriarch) and the pope aren't dependent on each other in the simplified world of the game.
pansoiatr: actually, the schism was again officially reversed in the middle of the 15th century, shortly before the Fall of Constantinople, when the emperor John VII negotiated the reconciliation of the churches in return for military aid against the Ottomans. However, the imperial decision was never popular with the Orthodox people, and when Constantinople was captured in spite of a crusade, and the need for the church union ceased to exist, the whole thing was basically forgotten and the two churches went their own way as before.
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