Why do you think yay has been picking smokes in ranked? I'm not joking. LEGIJA said he was a demon on Viper in scrims but suffered from mental issues which affected performance on BLEED. Now that yay is in tip-top shape both physically and mentally, he's ready for the big leagues.
Even if Yay doesn't pivot to a controller role, Zellsis can pick it up pretty easy. And of course, N4RRATE will pick up Sacy's reins.