Shadows of evil easter egg with 2 players possible?

[kilerbrambo88x]

Is it possible to do the shadows of evil easter egg with 2 players? Mrdalekjd says you need 4 players but i have heared you can do it with 2 players. Can you only zab one box in the trainstation with the last step? 

[Completechaos27]

If 4 players are not in the game, when the Shadow Man is captured in the summoning key, the giant gate worm will not spawn.

If a player leaves, or is disconnected after this step, it is still possible to complete the easter egg.