This is a list of the top 100 Major League Baseball pound for pound hitters of all time. I have omitted hitters who were suspected of taking steroids, and hitters who had an AB/HR ratio above 30. From this list, we can start becoming familiar with what really works in swing mechanics, as these are the hitters who hit with the most power and consistency despite their bodyweight.
To make a change to swing instruction, I believe it starts with this list. As a community, we can have an influence on swing instruction and baseball history. If you are good at data mining on the internet and can find these hitters' swings - preferably from the front angle - please a link to me in the comments section of any of my Youtube videos.