Auto-translated
So, can you buy and upgrade heroes with the initial Diplomacy skill? But can't use this skill – that is, can't recruit armies? Or can't these heroes be used at all (Adel, Roland, Kira)? And if they can't, then what should you do in a situation where this hero is offered in the tavern? Don't buy heroes at all, wait for the next week, buy and immediately dismiss them, or is there another way?
You can buy heroes with the initial Diplomacy skill as secondary heroes in the case when this hero is offered in the tavern, but you cannot upgrade them beyond level 2.
Added 4 minutes later
But this seems absurd to me... what's so bad if neutral creatures join me? After all, they can join anyone! Not every group will join, and it's not easy to find such a group...
And what about the month of my Castle (the month of Griffons, and I'm playing as that Castle)?
Can you prove it??
P.S. Maybe you can still recruit such heroes?
Yes, you can recruit neutral creatures, but only without the Diplomacy skill.
... прийти ... увидеть ... победить