If you are willing to pay for a life insurance policy for me worth Rs. 5.0 crores or so (negotiable), I am willing to go on record and say what is the most likely position with regard to Porus being a Jat.
Nobody - nobody - least of all, poor old Joe, takes panga with a Jat. Or more than one of them.
Off the record, the Jats were probably part of the Saka-Pahlava lot who came flying in one hard-ridden horse-ride ahead of the fear-crazed Tocharians, themselves flying from the ferocious Hioung Nu (ask our Chinese friends for details; one of them in particular is very good at their own ancient history).
However, this is a potent topic. My home list is Silk List, but I used to be active at PakTeaHouse. There a group of us became very close and set up our own rather whimsical mailing list. One of us is a Jat, a mechanised Sardar now a very prosperous surgeon on the west coast, a loyal Indian who is, like the other Indians on that mailing list a committed friend of Pakistan, a guy who is trying to see if he can set up scholarships for Pakistani kids to come and train in medicine in India. He forwarded us this (REMEMBER, IT WASN'T I WHO WROTE IT OR FORWARDED IT!!!)
FROM G***I:
You all may remember that recently some truths and half truths were
spread about the jats on this forum by some people like Hayyer (I may
have spread some as well).
Now while trying to read up on the Aryan invasion (or not) I came up
on this site that explains the truth about the Jatts.
It also has in its reference section similar truths about India,
Pakistan, Brahamins etc. that i did not have time to read yet.
enjoy!
http://uncyclopedia.wikia.com/wiki/Jat
http://uncyclopedia.wikia.com/wiki/Jat