So the problem is that the fnatic players aren't playing like some of the best individuals in the world consistently? You know that's what it takes for a team with xizt to become top tier. You can't expect players like twist and brollan to be individual gods without a system. xizt's only truly great team was NiP in 2013-14 when they had the best individuals in the world by far.
xizt's style is loose, it's only effective when you have confident individuals that consistenly find impact on their own. These players need a structure and a system to become consistent so that even when the stars aren't performing at a top level they can still find impact and have something to fall back on.