提案/Suggestion
The description of the Jack-o’-Head says that it increases attack power relative to the number of fellow hunters with the skill activated and that the effect is multiplied by 5 during the Halloween event.
My understanding is that the actual effect is +1% affinity, so that if all four of you are using it, then it is +4% affinity. Still not much. You can probably get the same from a driftsmelt.
Even if that becomes +20% affinity during the Halloween event, I am certainly not going to lose the benefits of my Coral Pukei helm and my hunting buddy is certainly not going to give up his Black Diablos Helm with three grades of Partbreaker, just on the off chance that the other two guys are also using the Jack-o’-Head.
The armour part needs to give significant benefit over whatever you use for the rest of the year, in order for it to be worth switching.
Or the benefit needs to be given also if you are using the Jack-o’-Head layered armour on a regular helmet. Because in order to even have the layered armour, it already means that you have upgraded the Jack-o’-Head armour piece to Grade 6.
現状/Current Status
Jack-o’-Head gives no advantage for high level players.