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Rupert won't last long on this map; he's a burden to the player. It's obvious, you don't even need to consult an oracle, just think a little. Horses appear in the Human castle towards the end of the second week, so the main character will have to deal with the first wave of attackers without any bonus. There are always significantly more besiegers than the castle has defenders, and only an adventurer would rush into melee combat; horses won't be of much help. Given the constantly deteriorating castle and capital, it's extremely difficult to find the money to train horses. Therefore, even by the end of the game, Rupert won't have a large, combat-ready unit to face the main opponents. And neutral creatures can be cleared out with any hero, especially since there's no fear of losing them and suffering a defeat.
Astrid, having lost the ability to create Phantom Titans, won't have an easier time either. I haven't seen many posts in the thread about her previous carefree life.
Urkrass's ability to cast random antimagic on one unit won't provide any advantages. Precisely because it's only one unit, and it's random. The Barbarians have very important combat units and just cannon fodder. The AI casts spells on the stacks that are dangerous, and if antimagic doesn't affect them (which is likely), there's no point in bothering with the new hero. I would definitely prefer to take Haggeesh instead of this puppet, because her bonus is significant and reliable.
Some dubious innovations.