I know nothing about Yoman, but Foxy9 has excelled in the Sentinel position. Single-handedly winning them rounds right from the start. Mako > Karon, Mako is considered one of the best controllers in the WORLD for a reason... He's himothy. Buzz has his off games, but when he's on one, it's hard to find someone who can reach his highs. Beyn in my eyes has proven himself as one of the best players in the first split. His aim is insane, his utility has nearly zero flaws, and the energy he brings to the team is so crucial!
Stax has proven himself on and off stage many times. It's odd to me that from 2 playoff chances missed they don't wait until the end of the season to make a final decision. It would've been far better to give the IGLing to another player like Beyn or Mako. They could've even pulled a PRX and have no IGL and base it on who wants to per map/series. This decision appears VERY rushed from the DRX staff.