I think it's just their sponsor who went seperate ways with the team.
OnT: Three of the players in NGE, former Ronin5 players, actually did well in that team. Wabbit, juv3nile and daps that is.
Even though I think ex-Exertus will have a hard time dealing with NGE, I still think they will win in the end since NGE is trying out a new rooster and got completely stomped by CoL. Although I will be placing a small bet on NGE, wishing for a miracle.