feel like anyone who watches Fnatic play can realize, they don't win because boaster is an amazing igl their entire team is just incredibly self sufficient which is to the counter of your point
d3ff0 played with 90 ping and a back injury in china bro he was improving by the time M3C was falling apart, and again d3ff0 is a role man he creates space, awps and thats it not many do it better.
Boaster being the best igl is debatable, don't really think he's not but theres just no proof or way for a fan to decide whos the best igl and just watching fnatic they don't have anywhere near as good of a meta read as EG and they were being outcalled by EG and still winning because their fundamentals are what wins not calling
you gotta have a level of understanding of the game that gambits main focus and star was nats and that every single round they worked to funnel players to nats, redgar is the reason they were able to force opposing players into nats. can't really give credit to boaster for alfa chronicle leo and derke having perfect spacing thats a coaching thing