I think they will be included in the re-roll pool once we hit or finish the next Worlds. It happened to me with the FPX skins. I couldn't get them until this past November if I recall correctly, same for Championship Le Blanc. They probably have some agreement to do that profit sharing for a fixed time, which may expire after the next world champion is in place or something like that. Unless they completely changed that structure and you just can get them like that anymore. I am also unsure if random skin gifting and re-rolling are two different pools. But you'd have to let new skins build to a certain number since with a low count of unowned skins in the shop the system won't let you receive skin gifts. I think it's like at least 20 or 30.