I'm not sure it did. After he left they had a few very good results, but the IGL spot is still an issue even if it's about fragging. Adren started out as the new IGL, but his numbers went down so much it wasn't possible. Dosia takes over, and they joked about how simple his calling is, so maybe it's too bad at the moment, but I don't think they need much more.
I see Gambit working very much like Fnatic 2016, with flusha calling because he has to and not doing a bad job or an amazing job. The difference is Gambit don't have the same intelligence as the Fnatic players, so it will be harder to get that to work, but they have some insane fraggers that will try to. Replace Dosia with a flusha-like IGL and they are fine.