Hunt credit is based on enmity generated. Best jobs to kill hunts with is a tank job. 2nd best is healing job. Healers cast their DoT on the hunt then spam AoE heals on the party. Even if all 8 people are on PS4, as long as 1 or 2 people is a tank and able to get a few rotations in, shoudl get full credit. ARR S ranks die to quickly for anyone to generate that much enmity though.