I understand it this way:
1. If I have the best hero, but I lose 18 battles with him, then I'm completely out.
2. What about luck and morale? Can I move twice in one turn and deal double damage, but if I try to repeat this 1000 times, it won't happen. Perhaps, in extraordinary circumstances (morale, luck, and the properties of some units that allow them to cast spells), I should take screenshots?
3. Question: what kind of terrain will there be on the arena? This can greatly affect things, including which units to give to the final hero. If it's a flat area without a single object, then everything is fine.
4. Will it matter with what advantage you won or lost? Will a preliminary ranking of heroes be compiled after the first round (i.e., if a hero with the lowest ranking wins against a hero with the highest ranking, will this matter)? Or is it just win or lose?
приведет в никуда. Карабкайтесь в гору чуть-чуть, только чтобы проверить, гора ли это. С вершины горы нельзя увидеть гору.