See the thing with Pinhead is that unberable torture is his best defense (and best weapon). I mean, if Jason, Freddy,Michael and Leatherface were to team up and try to slash him to dead he will love it. Besides Pinhead chainhooks could rip apart any body in to shreds. So even if all four were to take him on. Pinhead would just strap them up with his chainhooks and rip them apart.