No offense intended to your brother, but it had nothing to do with being 'OVER-ENGINEERED' for the opportunity. What you described was a very simple case of not being proficient or experienced with his equipment. I'm not a fan of blaming equipment as an excuse for incompetence.
Just because the scope has a turret and it's zeroed for 100 doesn't mean you walk around hunting with it dialed to 100. Why on earth would anybody do that? You dial it up to 250 or 300, etc (depending upon how flat shooting the round is I used 300 this year) exactly for situations like you described--point and shoot. Use the time available in a "snap shot" situation like that to concentrate on the shot. There should have been absolutely no difference no matter what scope he had.
A turret being on the scope was not the problem. Your brother not knowing how to hunt with one was.
