Their weapons are not better than steel. But for a few blows, they're also not much worse than steel. Jaguar Guards are not "practically naked", but wearing very sophisticated armor that protects well against all edged and blunt weapons. JHI are a specialist unit in that they're not as heavily armored as some others. Both units have superior training, but Jaguars fight as if on psychoactive substances... which they may well have been. They weren't expected to reach old age, after all. Also, pitting JHI against Jaguars is one ahistorical battle to start with, so don't worry about this too much, OK?