Question about graft density with HST

[Gandolf]

We see it advertised on Gho's website that he can do 35 g/cm2 and up to 50 g/cm2 on a 2nd pass. I am just curious if anyone has ever discussed with him why I denser result can't be achieved (either through a single or multiple passes). As we've seen, some of the best traditional HT Doctors such as Rahal and Hasson & Wong have done as dense as 70 g/cm2 so I am just curious if there is something specific about HST that limits the density, is it the skill level of Gho and his team just not being good enough to go denser, or is Gho able but simply being conservative.

Is there any information, either online or anecdotal from those patients who have had procedures and talked with Gho and his team? Thanks in advance.