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And the second question: let's say a freed Alamar has Expert Literacy; can it be used to teach another hero spells?
But why not? Theoretically, it is possible to obtain Expert Literacy on the second level!
However, this question may become irrelevant once it becomes clear what can be done with a banned hero from the dungeon.
Although, on the other hand, there are dungeons without guards and with heroes of the first level.
I suggest allowing all banned heroes, except for Isra, Vidomina, and Mullich, if they are freed from the dungeon and have level 10 or higher, to be used. Because their guard is comparable to the guard of a Pandor with all 4 magic skills.
I suggest adding an explanation to the rules that banned heroes cannot be chosen as main heroes, because, for example, Mullich, Luna, and Ciel can do a good job in the beginning and up to level 3.
Another point came to mind: what if, for example, Ciel reaches level 3 after a battle and is standing with a whole army, but there is no one to give it to. Should we dismiss everyone, including Ciel?:)