Implanting among preexisting hair

[duchaine]

I knew that implanting among preexisting hair is hard because the doctor can demage the preexisting follicles. 
from what I knew, if the doctor puts a graft on the top of a preexisting hair, the preexisting hair dies (at the best, the preexisting hair is replaced by the new one. At the worst, both hair, the old and the new, will die).
Today I read a statement from Bernstein that supports a different theory. He says that placing a graft on the top of another can be aesthetically not pleasing but both the grafts will survive.

 

“The reason to wait until the hair grows in, however, is so that you can better plan the subsequent hair restoration procedure. If two follicular units are placed on top of each other or very close together, you will essentially be creating a mini-graft and the results will not look natural”.

 

is he right? 

Edited January 17 by duchaine