losinhair

im currently a 5a, and considering strip surgery which ive been told im a candidate for - both doctors i consulted said theyd do around 3000 grafts in the front area where i have the most loss/thinning. my question is at this point can doctors definitively know where to remove the strip from to guarantee its terminal hair?? my worry was if in later years i progress to a nw6 or 7 my scar would become visible since id lose hair directly above it. i was just worried because you see many guys where that "ring" of hair around their head is tiny, so i was thinking since im ont to that point yet, how would the doc know where exactly to remove the strip from thanks in advance for any answers!