Immortals CSGO roster has been facing lots of problems with their roster. After kngv caused a furore during a LAN tournament, the team saw three of its most prominent members quit the team. This led to Immortals losing their CSGO major slot. It also led to the organisation being disqualified from several leagues wherein they had used the old 5 man roster.
— Flashpoint (@Flashpoint) November 21, 2017
The rules for ECS state that the organisation should maintain a similarity in the majority of the roster. Ofcourse with 3 people leaving Immortals, they were not able to meet this criteria.