https://www.youtube.com/watch?v=nnVjsos40qkIZ*ONE can become a permanent group and have kennin (concurrent position) with other sister groups. Not only can 48G benefit from the revenue they are giving, they can benefit from the increased international coverage. I'm sure the girls would appreciate raising the local profile of the group, strengthening the brand's reputation, securing the future of the group.
I really have this strong hunch that there's a contract agreement between AKS and Mnet that the other members of IZ*ONE will have kennin or concurrent position around this time just before the Olympics 2020, and they will be joining the World Senbatsu Elections.
It's a common activity in 46G/48G where members of a group co-promote with another sister group.
They've been hinting about this, with IZ*ONE performing some of AKB48's songs, and having a collaboration with 46G/48G. IZ*ONE has a thing for giving hints and spoilers about their future plans and activities.
Since the Olympics is postponed, this plan is postponed as well, and they will have a contract extension because of this most likely.
Based on my analysis, these are the groups where the other members will go, ofcourse Sakura and Nako are already in HKT48 and Hiichan is already in AKB48.
AKB48: Wonyoung and Yuri - AKB48 will have the bigger piece of the pie, Wonyoung is center so the best will go to them and Yuri is Mnet's baby so she will go to the motherhen group
SKE48: Yena - Tough and versatile just like SKE's leader Jurina
NGT48: Chaewon - Fresh theme
NMB48: Eunbi - Hot theme
STU48: Hyewon - Friendship theme
Nogizaka46: Minju - Crown jewel of IZ*ONE goes to crown jewel of aki-p
Keyakizaka46: Chaeyeon - Performance theme
Hinatazaka46: Yujin - Youth theme