Overlord Theory: Not an Isekai

 I think it's [I have no mouth but I must scream]. Satoru believes he's in charge of momonga, but he isn't. Momonga does the thinking and makes the decisions, but he has a confabulating narrator hanging around in his head, who makes up reasons why the things he thinks he's doing are his own idea. Momonga genuinely is the high-tier strategist demiurge thinks he is, but satoru isn't privy to the real cognition, so it all comes out of the blue for him.

 I would say satoru briefly had influence. Momonga wouldn't bother groping albedo. "But since I didn't act on it, my lust went away." I think satoru's influence all but vanished at this point. Perhaps momonga sleeps occasionally and lets satoru run amok, primarily for comedic episodes contained entirely in the tomb. 

 Realistically, could satoru fool demiurge? Not a chance. Hence, demiurge is not being fooled. It's only the readers, or perhaps the author himself who doesn't understand what comes out of his pen.

 What I like about overlord is almost entirely confined to the first volume/season. First, non-superstitious military preparedness, such as maintaining proper stealth in an unknown environment. Second, reacting to normal heroic triggers with open villainy. Hero: "I will visit justice upon the perpetrators." Ainz: "I will visit agony and despair upon the perpetrators." If you antagonize his stuff, he will show you he is the greater antagonist.

 P.S. Satoru is a loser. His only goal is to find other players, ideally other members of nazarick. There are no other players. Contrast: although luffy will never find the one piece, it either exists or he can get rich off some equivalent treasure; he's only being cockblocked by author fiat, diablos ex machina. Satoru was doomed to failure since chapter 1.
 Momonga knows this which is why nothing he does makes sense in terms of finding players, with the exception that he would rather not be taken by surprise by one.