Let's say you are driving a pile into a fairly granular. "Friction" and "End-Bearing" are both "there". You can determine the frictional carrying capacity and then the end-bearing capacity - add the two together and get the total. Now, when the load is applied, depending on how you have determined the safety factor, the load will initially be carried by the friction with very little being carried by any of the end-bearing component. If the load starts to exceed the frictional capacity, then the end-bearing will take up the additional load. Why? Friction takes very little strain to mobilze. End-Bearing takes more strain. - they are not compatible. Friction comes first (with a bit of end-bearing), then as the friction peters out, the end bearing will take on more. I found that the friction might be about 35 to 40% of the ultimate capacity. Using a Safety factor of 2.5 or so, the frictional component would be nearly the same as the applied loading.
For clays - with Nc only being 9, there is very little end bearing and the bulk of the load carrying capacity will be adhesion.
If one is driving to rock, the pile capacity might very well be the material property of the pile.
Anyway that's my late night take . . .