Guiding Fushiguro Megumi and others is not a difficult task for Reiger.
Although Reiger has only recently started to delve into the Jujutsu system and can't be considered a master, his level is evident, and he possesses the necessary insight. Moreover, this is not Reiger's first time guiding others.
In the Akasha Continent, Reiger guided Liz and taught her the Breath of Love.
In the Demon Slayer World, Reiger guided the Pillars of the Demon Slayer Corps, helping them continuously surpass themselves.
In the Overlord World, Reiger also guided Brian, teaching him the Breath of Thunder.
Even in the Earth Mistake World, upon his last return, Reiger was able to guide Ais and Rephia, helping the former learn the Breath of Wind, and the latter to master more magical techniques.
Therefore, Reiger is long accustomed to guiding others with ease.
Moreover, not all of Fushiguro Megumi and the others need guidance on the Jujutsu, so Reiger has more than enough capacity to handle them.
