As a result of this unexpected announcement by JYPE, IAMs are very mad and upset because the information that they will be performing were released after tickets were sold out. This means that without Hottests on the venue, there will also no IAMs who can show support for 2AM. 2AM might get less support than anyone else.
Furthermore, there is no confirmation that 2AM’s performance will be broadcasted. Similar to 2PM, 2AM’s performance might just be seen by the Dream Concert audience.