On FaZe their main strength was either a fast exec early or off a quick mid round call so I figure he reads the game well. EG and C9 proved that you don't need a FNS tier IGL, lots of intelligent players that can contribute to main callers have been running the game ( leaf, ethan, c0m, )
I would even argue that fnatic has 5 players who contribute a lot to leading the team, especially Derke mentally, during lock//in boaster was breaking down when loud was up on icebox and you can read that Derke had the energy to bring everyone back.
Sentinels have to find out what works for them and coach Marved in stuff that a viewer can't see so, being a leader mentality wise and being able to always have a call no matter what ( something they praised dephh for )