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It turned out that creature specializations are tied not to the Tier, but to specific "crates." That is, if we systematically change the Tier or even the race of a creature, the Hero, or rather, their Specialization, will remember it and will work specifically with them.
For example, after Minotaurs became Tier 5, Kifrah's Specialization automatically started working with them, and her starting army changed to be similar to other Tier 5 Specializations (Creature Tier 1 + Tier 2 and one Tier 5 unit). The same happened with the Tier 6 Specialization in the League. After Witches were moved to Tier 3, the Specialization still remembered them and worked with them. However, since Erin is not a "standard" Specialization based on creatures, her army became like that of ordinary heroes (as it was before) - the same can be said about the Goblin Specialization. Its Specialization is formally Tier 1, but it starts with a regular army.
*The starting army itself is defined in the "RPG file," so I don't see the point in discussing it further.
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As a result, what does this give us?
By systematically rearranging creatures by Tier and Faction, we can indirectly transfer creature specializations, adapting them to another creature.
For example, by systematically swapping Goblins and Faeries and giving Kigan or Dirael's Specialization, we can make them a non-standard Specialization for Faeries. (They will receive weekly reinforcements of Faeries or Greydrakes, if available).
The "Wyvern Tamer" Specialization can also be transferred and adapted to another creature, and the bonuses from it can also be edited in the "RPG file," as it is defined there.
*Of course, I'm not talking about the simple rearrangement of "standard Specializations" - it's clear that Laslo's Specialization can be changed, for example, into a Specialization for Monks, giving humans a Tier 5 Specialization.