InoyOleh
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If we take your scheme with only 6 levels: 0-3-6-9, then the following order of tiers should be used:
0 - Tier 1 without arrows.
3 - Tier 2 without arrows, Tier 3 with 1 arrow.
6 - Tier 4 without arrows, Tier 5 with 1 arrow.
9 - Tier 6 without arrows, Tier 7 with 1 arrow.
In this case, I would NOT add arrows from the fort, Stronghold, or castle!
Although, 1 arrow looks better than 2, as it was before.
2 arrows from the fort, Stronghold, or castle is very bad for variety.
In your example, I would definitely remove the arrow from the Stronghold to the Knights or Griffons, and from the Guild to the Monks.
That's why I like the standard 6-level scheme 0-3-6-9-12-15 more, as it provides more room for maneuvering when building structures. And there is no detrimental dependence on forts that harms variety.
Although, I admit: if only 1 arrow goes from the fort to a Tier 3 creature, or, as with the Stronghold, 1 arrow to a Tier 5 creature, then this is acceptable.
P.S. Regarding the bonus for the second player, I would not remove a building from the first player, but rather give the second player 2 free buildings: either a Town Hall, or a Tavern, or a Tier 1 building upon arrival. (Choose what will be more balanced)
0 - Tier 1 without arrows.
3 - Tier 2 without arrows, Tier 3 with 1 arrow.
6 - Tier 4 without arrows, Tier 5 with 1 arrow.
9 - Tier 6 without arrows, Tier 7 with 1 arrow.
In this case, I would NOT add arrows from the fort, Stronghold, or castle!
Although, 1 arrow looks better than 2, as it was before.
2 arrows from the fort, Stronghold, or castle is very bad for variety.
In your example, I would definitely remove the arrow from the Stronghold to the Knights or Griffons, and from the Guild to the Monks.
That's why I like the standard 6-level scheme 0-3-6-9-12-15 more, as it provides more room for maneuvering when building structures. And there is no detrimental dependence on forts that harms variety.
Although, I admit: if only 1 arrow goes from the fort to a Tier 3 creature, or, as with the Stronghold, 1 arrow to a Tier 5 creature, then this is acceptable.
P.S. Regarding the bonus for the second player, I would not remove a building from the first player, but rather give the second player 2 free buildings: either a Town Hall, or a Tavern, or a Tier 1 building upon arrival. (Choose what will be more balanced)