Lol I don't think that anymore...because the T A O in Exact spell Tao, then the three in the album cover probably represents that Tao was the third member to be revealed as an exo member, you can see the words XOXO written on the album cover if you see closely...idk what that means but in the monster music video there is a watch in the first few scenes which probably represents Tao and his time controlling powers from Mama. Then at the last scene of the lucky one mv, when the robot nurses are watching from the huge iPad thingy...there appears the maze/logo from overdose era and inside the small hexagon which is secluded from the rest of the maze there are three lines probably representing the former exo members, then we see 9 other lines scattered around the maze those lines probably represent the current members.