AU Ner'zhul could have challenged AU Grommash and chea... won the Mak'gora by just using his Shadow magic (mindblast, shadow corruption etc), same way Thrall did to Garrosh and stopped the Iron Horde.
Same with Gul'dan. He could easily slaughtered Grommash in a Mak'gora with his magic, and take "honorably" over the Iron Horde and made them drink Fel Blood, and eventually installed Blackhand, Kilrogg or Kargath as new Warchief.
What stopped Ner'zhul or Gul'dan from doing this? We saw at least Gul'dan taking down Grom in 1 sec. Defeating Chieftain/Warchief in Mak'gora gives you immense honor.... of course, if it's not seen as cheating by huge portion of viewers.
Was using magic in Mak'gora normalized after Thrall's duel? Because we can't have our nicest neighbor, most humanized Orc, never does anything wrong Orc, your perfect son-of-law Go'el a.k.a Thrall labeled as cheater? Despite that viewers thought he cheated.
The fact that Thrall got away from using magic an Orcish duel of Garrosh, creates plotholes. Imo it feels like the movie has well better thought about this than the game. I get Metzen hated his favorite Orc boy called cheater, but he is retired. Mak'gora rules need to be redefined for return of Garrosh and make sense with PAST lore.
Mak'gora meaning = Duel of HONOR.
There is a reason why every Orc Chieftain is a Warrior. And is honored and respected by their clan. Cheating is NOT honorable. Not by humans not by Orcs.