Harald won't be joining rocks in God valley. If anything he was their on command of gorosei to take out rocks and may have even dealt the killing blow.
Don't forget Harald later on went to holy land and met shanks there. I don't think he would be allowed to enter holy land if he openly joined hands with xebec and he is too old and matured to pull the same thing he pulled back in the day.
Don't forget Harald later on went to holy land and met shanks there. I don't think he would be allowed to enter holy land if he openly joined hands with xebec and he is too old and matured to pull the same thing he pulled back in the day.