Because of the end in the minish cap manga, when Link and Vaati kind of vibe together and agreed about Ezlo as a teacher/guide.
Wouldn’t it be funny that Four and Vaati actually became really good friends and they make those really dark jokes like: Remember when I trying to kill you? - Of course I was even there!
The others don’t really know whats going on and are really concerned.
(Also the other two times Vaati appeared. Well that wasn’t him, but the darkness/evilness that got seals in the sword and just took the last form before losing)













