Theory for the sml finale

Okay so we all know that Logan said he was gonna end sml when he turns 40 but now since the secret door 2 came out and we aren't sure if Marvin killed the right Brooklyn guy I've got a theory.

For the remainder of the series up until the finale Brooklyn guy will act like his usual self and within that time he is setting up a big elaborate fool proof plan to kill everyone. In the finale which maybe could be a movie, he would finally act upon this plan and everyone in the sml house would be in the secret room but then the real Brooklyn guy would come down from heaven or hell or wherever he ended up somehow and he would try to stop him or something. And since this would be the theoretical finale maybe it would have some REAL character deaths or maybe everyone in the sml house would be dead, just to add more emotion for a finale.