its Zabuza not zanza

i read somewhere that 2 dot was insight (seeing and copying) and 3rd eye was illusion (genjutsu)

as far as we know the sharigan cannot copy genjutsu unless they saw the seals being formed, taijutsu can be copied if they can keep up with the movements and its effective at ninjutsu

i think that the sharigan cannot copy seals that go beyond its speed, like Sasuke couldnt copy Orochimaru while hes executing a jutsu on pure speed alone

also i dont think Kinjutsu can be copied (things like Orochimarus dead summoning and stuff)
and summonings cant either