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No, you don't understand. I have Heroes of Might and Magic VI, and I specifically bought it to create a more detailed map of Ashan.
And here's what I can say:
A large part of the heroes in Heroes of Might and Magic VI are simply copied from Heroes of Might and Magic III, and therefore it's logical that Sandro is there. There's also Shiva, and Ciel (only for Necropolis), and many more, I just don't remember them all, but there are a lot.
In this case, Heroes of Might and Magic V is unique, both because all the heroes are different (without any borrowing), and because the events of Heroes of Might and Magic V take place 400 years after Heroes of Might and Magic VI.
The Hungarians didn't even have enough brainpower to come up with a couple of dozen new heroes.
But I would like to create a story after the events of Tribes of the East, even after Dark Messiah of Might and Magic. Like, Arantir dies, but others appear, and so on.