Yeah this has been a running theory since early on though not necessarily everyone thinks Bada even exists outside he may purely be an inside existence that Doha grew attached to as a developer/player.
He could also be based on a real person since one of the other players is the cousin and a real person so if they were all developers creating a game together (college friends for example) that player could’ve been like remember my cousin who passed, in his memory let’s include him. Then Doha could’ve had some wild backstory and so on so forth that’s why he couldn’t imagine leaving what’s left of him. This author has created such a convoluted and well thought out plot that no one can figure out the actual ending haha.
I have a different story theory rather my old Theory
Doha knows how to escape but since bada is an npc he can’t escape with him and leave the game that’s why he is refusing to do the jobs faster,maybe bada is dead outside the world and he is only alive inside the game but Doha refuses to let him go