I think the 2 members that disagree to the reunion are the members that knew they got rigged into izone by their companies, they don't want to bear those guilty feelings anymore so they disagree to have a reunion.
The one member that doesn't give any statement is probably Yena, Yuehua seems kinda secretive i think and kinda hard to approach? Idk, the company just gives me that feeling.
The 4 members with solo activities are Hyewon, Chaeyeon, Minju and Sakura imo.
Lemme stop there because y'all will know who i think got rigged into the group by the company