It may not load the areas of the pecs the same, but it still stands that mechanically, the pec is designed to bring the arm across and down. Thats their entire purpose, and it recruits the most fibers doing that. Which is exactly what I said the whole time.
Plud I dont think BB.com diagramds, no matter how fancy, are going to convince the scientific crowd. Lots of bro-science in all their logic.
Well studies have been done that prove putting a bench on a slight incline 10 - 30 degrees does activate the fibres in the upper chest more than flat or decline.
Incline is superior to standard flat or decline pressing for this purpose and this is backed by exercise physiology testings .
To get the most activation of the fibers in this area then flat pressing or even inclining with a reverse grip is the best pressing motion to use, again backed by studies.
A slight incline is superior for full pec development as the body naturally drops shoulders back and arches the pecs upwards and this lends to activating the upper section more,
giving the so called perfect set up for benching for full pec development.
People that are genetically blessed for flat benching just fall into this position on the flat , chest high, shoulders back and down and shoulder blades pinched together , these people
have the perfect structure for benching and can develop full thick pecs from top to bottom with flat benching alone - think nubret and columbo as prime examples.