I don't think you know the full story behind those IEM/WESG wins.
Fnatic already decided to kick Golden before IEM Katowice, so they didn't even train with him before the event. Instead, they just showed up and treated the whole tournament like a pug match. Flusha and Krimz hardcarried Golden and Lekr0.
Both Flusha and JW have said that Golden improved a lot in Cloud9 and is a completely different IGL, which is why they've given him another chance.
Lekr0 has had too many chances. He's tier 2 trash.