It doesn't seem like a coincidence that there are "additives-free" Marxism-Leninisms of a few different kinds, most of them anti-revisionist, and then Maoism (you may want to count Hoxhaism separately if you wish), and not "Marcyites", "Martensites", "Sisonites", "Avakianites", etc.
In the case of the divisions of Trotskyism, there are at least 20 varieties