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Well, for example, the red player spends the entire game in that state and doesn't place heroes in the castle garrison. I doubt the blue player has more advanced intelligence.
In theory, a hero cannot move to the castle garrison if the option to have them stand still is selected. Because, with a certain amount of bad luck on our part, Double Bert would end up in Fronke and activate the Operator.
Added 50 seconds ago
It's a funny speedrun plan. You just need to struggle a little bit)
Added 55 minutes ago
Yes, in the finale, you'll have to leave two prisons (for the Bone Bowman, not the Damelon). And you'll need to clear out one red player beforehand, or better yet, two. But with that many troops, you can somehow solve this problem)