I think Adren has done it only in situations when there have been no clear IGLs in the team. The others you listed are just idiots equivalent to the people in MM saying they have superior understanding of the game because their stats are boosted by 0 impact frags and baiting. That's probably the reasoning behind most such cases.
Well, I'll give Lekr0 some credit for his work (also no one else in NiP should be doing it).
Basically good players want their team to mimic their play styles so they can win more but at the end these good players are overwhelmed and find their stats to fall.
Adren did it because zeus left and no one else couls do it.
Lekro doesnt want to but he has to
Because they think their igl dragging them down.
Usually they do it because at the moment they don't have anyone else on their team who can do it, so they try to set themselves up for success. There's nothing wrong with that mentality in my opinion, but getting a new dedicated IGL would still be better for the team.