your questions regarding the game rules (improving the interpretation).

1) Options involving monster forces will only complicate things.
If you look at the passage from the rules:
A restart is allowed at the player's discretion if they own the Castle and it is impossible to bypass the block that cuts off the Castle from the main part of the starting zone, leaving no possibility of development up to the block.
Here are some points that may cause disagreement: the main part of the starting zone, the possibility of development up to the block.
If I read "main part of the starting zone," then for me, it's 70% of the starting respawn area, and 30% is not the main part... which is absurd if that's how the respawn area is divided. The possibility of development – as discussions have shown – for Kosti is collecting gold and building buildings; in my understanding, it's only about upgrading the Castle. This again causes disagreement...
In this case, the rules need to specify:
1. If you are blocked in a city and the block cannot be broken, then a restart is allowed. If it can be broken, but with losses of more than 50%, then a restart is also allowed.
2. If there is a controversial situation regarding breaking the block, then the owner of the block tries to break it first, reports the result to the opponent; if the opponent is not satisfied, the save file before the battle is sent to the administration.
As mentioned above, canceling the restart due to a block is also an option.

2) Cancel "hit and run" tactics; if someone is killed by magic, it's their own fault for not being prepared.

3) So, here's the next situation that occurred in a game against Dark on Jebus... in a controversial situation, Pit and Dirty helped me figure it out (I have great respect for both of them!!! and I definitely don't want to accuse them), but in this situation, my opinion differed from theirs, and the answer to the situation did not satisfy me. That is, here too, it is necessary to specify so that there is only one option, and not more, which would cause disagreement. Namely (the option in the screenshot):
So, the red hero flies over the Trezh! (flies from one passage and kills the guard on the other) then kills the Guardian of the Outpost from the Monarchs. In my opinion, this is a violation because, ideally, he should have broken the Guardian of the Outpost from his respawn point from the passage where the Monarchs are, and then gone to the other zone, instead of doing this by running through the Trezh...
Let's read the rules:
2.6. Transitions between zones.
By the words "a specific passage between zones" on the generated game map, it means the space between obstacles that form the boundaries of zones, through which the hero can pass into the adjacent zone. In a real game situation, there may be several such passages, even if the template scheme indicates that the passage is the only one.
On all templates, except for XL+U size templates:
2.6.1. In order to pass from one zone to another through a specific passage, it is necessary to eliminate the guard of this passage. If there are several guards on the passage, it is enough to destroy any of them.
Reading the rules, I don't understand why such actions are allowed?

4) In the Castle, it should be allowed to upgrade to level 6 at the Conflux.

For now, that's all according to the rules.