Chosha: Godly unit, or military academy bug?

[onepiece]

The only problem with sacrifice is that is very expensive in terms of mana, units sacrificed and requires lots of intelligence to raise a small number of level 4 units (it makes it difficult for a warrior who has the most leadership and the least mana to use it).

Plus sometimes you get it near the end of the game so most of it you're gonna play without it. And it makes problem if you're doing a no-loss game.