Okay, I'm no expert, but as to my comments, I'd say he's correct on one point and totally wrong on another. Sure, if you punch a 3/4" hole through both lungs, the deer is going down. It's just a question of how long will it take for the animal to bleed to death orsuffocate. As to the larger cutting diameter being "mostly hype", he's way off the mark imo. All things being equal, the larger the cut, the faster he'll bleed out.
A smaller cutting diameter would result in less planing in flight and less surface area to create friction during penetration, and that might increase your chance at more consistant pass-throughs, but as for me, I'll stick to a properly tuned, properly sharpened 1 1/8" cut 125 grain Montec. If your bow AND your arrows/broadheads are properly tuned, the bigger bladed broadheads will fly true and make a much bigger hole.