Same thing I asked in the other thread,

Itachi Anbu: Joint skill, satsugatsuka flash

Activation path: "lifetime friends" "commitment"

Assist links required: 1

GNW Sakura: Joint skill, nine-tails chakra cloak

Activation path: "reliable" "true love"

Assist links required: 1

If you go by that there are 2 characters that can activate it and you only really need one. so who are the other characters?, people not in the game at this time?