Board Thread:Naruto Discussions/@comment-4080775-20150907043931/@comment-734582-20150907111243

I'm still somewhat confused about the exact point.

So a Kekkei Mora is essentially a whole, complete set of DNA that encodes a specific ability. Kekkei Genkai are only fragments of this DNA set, and thus only evoke fragments of this power.

E.g.
 * A Sharingan contains the power to alter perception of reality (Genjutsu).
 * A Mangekyou awakens the power to impose one's own reality on others (Tsukuyome, Amaterasu, Kamui, etc).
 * A Rinnegan awakens the power to alter reality itself
 * A Rinne Sharingan awakens the power to alter reality entirely (transporting people), subjectively (Infinite tsukuyome) and to break the barriers between dimensions (the dimensional tear ability).

In a way, the Mangekyou awakens only fragments of a Rinnegan's power (powers tied to death, reality and dimensional traversal). A Sharingan only contains the bare minimum of powers (perception of reality and altering people's perception).

Reality is to be taken as a somewhat broad term. Itachi always went on about how how one's reality is another's illusion. Powers like Izanagi blur the distinction between one's dreamed world (being alive) and the real world (dying). Tsukuyome creates essentially a reality under the user's control. Amaterasu is an ability that defies normal reality (it burns everything, even fire). Etc.

The Byakugan as a Kekkei Mora is not entirely clear. Given it's Yang (physical) nature, it may be that her bone-related abilities were indeed meant to be part of the Byakugan.