When sufficient weight is used, i feel that the upper pecs do come into play assisting when i do weighted dips or flat benches, the question remains is: if i become a lot stronger doing one year of just weighted dips (no weak delt links here), will the amount of weight i be able to use build more upper pecs eventhough eventhough only part of the stress goes to upper pecs?
iow: on pound for pound basis i think incline benches stress the upper pecs more, but if front delts become at some point the weak link, would it be beneficial to focus on dips and just push away much more pounds thasn you would be able using inclines and get full upper pecs anyway (if genetics allowes it?)