Grand Finale: Obviously not to Skyrim or The Elder Scrolls note the mod can be started as soon as the player gets to the inn at Dawnstar, and it's removed from the main questline, but rather, the mod as a whole is meant to act as a finale to the conflict between Molag Bal and the Dragonborn - while it's not required, it's highly recommended that you complete Molag's Daedric Quest, the entire Dawnguard DLC, and any other mods you have that involve Molag note The Grey Cowl of Nocturnal and Rigmor of Cyrodiil being 2 prominent examples that feature Molag before tackling this quest.

Bal and Altano are both the Bard, Bal from a timeline where he remained a slave of Molag Bal and Altano from one where he broke free at the cost of his memories. This is shown through the branching paths.

For Want of a Nail: A Dragon Break is in effect, so multiple timelines have come together.

Evil Versus Evil: Jyggalag is invading Coldharbour right as the Dragonborn arrives.

This especially bites him in the True Ending, where the Bard is able to let go of Lamae after her death, shocking Molag Bal who can only say he does not understand. Obviously, this doesn't happen in any ending that isn't the Worst Ending.

He needs the Dragonborn to indulge in their worst vices (in gameplay terms, achieve less than 50 karma) so that he can use them as an Unwitting Pawn to escape to Aetherius and to some extent seems to expect it due to the Dragonborn's dragon soul.

Evil Cannot Comprehend Good: A major component in why Molag Bal's plan falls apart in any ending that isn't the Worst Ending.

This having been said, Morihaus is still depicted as a demi-god with the power of the thu'um and strong enough to lift a giant with one hand, and both he and Belharza tower over other humans. Belharza even scoffs at the notion that Alessia would 'open her legs for a beast', and suggests the myth was Ayleid propaganda to smear his family. The mod depicts them both as human, with the idea of Morihaus being a minotaur coming from the fact that he never took off his armor, which was fashioned to look like a minotaur, in front of people.

Demythification : In Elder Scrolls lore, Morihaus is described as a 'winged bull man' and his son, Belharza, as one of the first minotaurs.

Rigmor of cyrodiil legendary edition