I know what you mean, but this is the TA equivelent of "If a tree falls in the forest and no one hears it, does it make a sound?" argument
a. If divergence is present on your chart with your chosen oscillator, does this mean that divergence is somehow absent on my chart simply because I didnt use the same oscillator ? or I used different oscillator settings ?
b. I suppose strictly you might say yes there is divergence between indicator G with settings x,y and z , but in practical terms, we'd still be observng exactly the same thing, you would see divergence, and I would not.
c. I assumed that the OP was asking is it possible to observe the reduction in momentum at the HH/LL purely through observation of price action.