Multiplication or not - mohawk hairstyle should be achievable
In theory you could transplant all hair from sides / back and put in on top
Since HST leaves no white dots, even if you deplete donor area by 70% it should not really matter as you would shave sides and back anyway
wouldnt you rather have mohawk or horseshoe
Lets say multiplication isnt happening, you can still have 12-20 000 FUs transplanted on top and I think it would look great, assuming no scarring
Let us please bear in mind, not only the donor-, but also the recipient-area is limited in how much work can be done. One cannot simply transplant, say, 150-follicle-units/cm^2 — the receiving tissue is improbable to support this, even across multiple, staggered surgeries.