If Esata the Stone Golem and the three Holy Nation leaders are dead, the United Cities should take over Blister Hill. However, due to the fact how priorities are set up, the player can never achieve this override because they'll either get Flotsam Ninjas or Holy Nation Outlaws takeover versions of Blister Hill override.
Trivia
Curiously, unlike most other United Cities overrides in The Holy Nation territory, this override does not account for Emperor Tengu and Longen. This may be of a result of this override being setup incompletely and incorrectly, which is likely to be the case, given the fact that this override is never capable of being achieved during normal gameplay means.