The strongest hero.

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If I understood correctly, by the scenario — you mean the game's scenario? But here, the developer's favorite seems to be the clear favorite — Zehir, who is young, promising, powerful, and hasn't lost a single battle.

Yes, according to the game's scenario and the history of Ashan. Zehir might be a favorite, but it is still implied that the Overlord is the strongest. Young, promising — nonsense; Zehir's youth will pass and he will die, and all his prospects are based on his father's efforts and the magic of the djinns.

[Please go into more detail; by that I meant the art of generalship: two roughly equal armies are given to the heroes, and whoever wins is the stronger. Otherwise, I don't quite understand, especially regarding the troop bonuses.
/QUOTE]
I'm not talking about the art of generalship; here, the Overlord is likely not the first. I'm talking about the influence on the army via attack and defense parameters, meaning the game mechanics. Here, the Overlord clearly has more of these parameters than the others.
Bonuses are the usual bonuses in the form of "attack base," "defense base," initiative, etc., everything that depends on the hero.
Although I don't entirely understand the essence of this statement, I will say that if anyone, Gotai should not even be mentioned in the list of the strongest.

Same as above. Gotai has high attack and a well-developed shout, so he influences his troops quite well.

Markel, yes, is a strong sorcerer, but the Overlord hasn't been seen creating great spells; on the contrary, his magical abilities were not spoken of very highly, and here Raelag's candidacy is not out of place — he has not only Warlock magic, but also the magic of Tieri and the Order of the Dragon. And if Markel is here, why not Arantir?

What do you mean "hasn't been seen"? He possesses first-class Chaos magic, casts "Hell Wave," and can teleport his form anywhere.
And who spoke poorly of his abilities? No one, as far as I know. And Raelag is clearly out of place here; he is far behind Kha-Beleth and Markel.

Above, I spoke about the battle conditions. If Kha-Beleth's hands and feet are tied by some super-powerful spell, immobilizing him, and his opponent is decked out in powerful artifacts like the Skull of Shadows, then who will win? Of course, such a situation is highly unlikely, but the conditions of the clash play a very important role.

Under such conditions, even an ordinary hero would win, although it's unlikely you'd manage to immobilize the Overlord — he'll just teleport, and that's it. Plus, the Overlord's magic resistance is quite substantial, inherited from Urgash.
But still, if the conditions are equal, it's unlikely any of Kha-Beleth's opponents would survive.

So, the head of one of the 7 powers of Ashan is not the arbiter of its fate? Hm, in that case, only Sareth can be counted among the arbiters of Ashan's fate.

No, even he, were he the monarch of the Empire, would still not be the arbiter. We apparently have different understandings of influence over the world's fate. I mean whether he can stop its destruction or cannot. Or whether he can destroy it. At least permanently erase some kingdom. Raelag is too small a figure for that.
The Overlord could be added here (besides the dragons). Without him, Sareth cannot destroy Ashan.

It seems that after the final cinematic, it's clear that Igganox is united and the demon worshippers are finally exterminated.

After which cinematic? He united Igganox and bolted after Isabel. And generally forgot that he is a chieftain. Eliya was the one who finally united the dark elves.

Well yes, besides the fact that they seriously crippled the demon army and showed all of Ashan that one can safely bolt into Sheo, kick the Overlord's backside there, and return home intact.

Yes, and they also showed that without a time bomb, returning was impossible. And then Ashan learns with horror that they arrived there, but were unable to stop the Overlord in his intentions.

He is not only the heir of Tieri, but the sole (or one of the few) heir of one of the strongest and most glorious orders of Ashan with a thousand-year history, knowledge inaccessible to others, and other things appertaining thereto. The Order of the Dragon has always been a serious force in Ashan, and all its heritage passed to Raelag.

Exactly, the Order was strong and influential. And now all its heritage has gone to an unreliable being who is ready to incinerate the world for the sake of Isabel.

The Messiah is born, but it is unknown whose side he will take (and it seems to me that Ubisoft will prefer a happy ending). Ashan is in ruins, but the demon losses are also very high. And I think I saw an interview last summer where it was hinted that a duel between Raelag and Sareth is quite possible, so Raelag will still try to stop the Dark Messiah.

It seems to me that Ubisoft will still make two development options. Demon losses are always high, but they have always been able to restore their numbers quickly.
If there is a duel between Raelag and Sareth (which I really want to see), then most likely Raelag will lose, because Sareth must survive (according to the scenario) until the moment where he chooses which side to take.

Дайте мне всего шесть строк, написанных рукой самого честного человека, и я найду, за что его можно повесить.
Весьма хороший попутчик... До первого перекрестка.

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The strongest hero.