Gaia is slow to do things, but fast when it does. May I activate Arcueid after his successful completion of his third and fourth labor? Basically, she'd make a post on the community asking for a unique sort of worldhop, and Yukari just happens to give her one...hmm, now wondering about Yakumo's influence.

Somehow, she knows where Issei's going...but she doesn't know its Issei at first.