Why waste grafts in the forelock? Strategically speaking, if he already has hair in the center the wise thing to do would be to pack the sides and temples. I agree with 2,500-3000 graft estimate. Furthermore, Its a mistake to be considering FUE. You're rolling the dice with FUE when you need that many grafts. Many take it for granted they will have good yield with FUE what with all the online photos. Reality is that its more hit or miss. When you need such a large number (~3k), its not worth the risk. FUT is a much more safe bet.