1) Do we need to equip Pre-emptive materia on the third character to skip the special battles?
Because, when I equip Pre-emptive materia on the first or second character, max Pre-emptive materia rate = 85, and when Pre-emptive materia equipped on the third character, max Pre-emptive materia rate = 213.
Description about Pre-emptive materia:
A 5-star ONLY Pre-Emptive Materia will also HALVE the chance of getting the Ambush and Back Attack special formations. This ONLY works when you place the Pre-Emptive Materia on your 3rd (last) character.
2) What are the maximum chances for Pre-emptive materia to skip special formation battles on the field maps and world map?