Yeah because of stan having the same brain shape. The main problem in the argument there is that bill, even if revived in the slightest, wouldn’t remember much more than the summer, and would have none of his power
Then why didn’t he do that to escape his OG prison or to destroy Mabel and Dipper instantly? My guess is that his power has a rule that states that he cannot make a deal with himself
Because his physical form was not banished but destroyed meaning he could only make non-physical deals and therefore would never terrorize anyone smart enough not to let Bill in and therefore he’s no longer capable of terrorizing more than one person at a time