I personally suspect that the peace jirga has nothing to do with establishing legitimacy in the eyes of Afghans and everything to do with establishing legitimacy in the eyes of Americans. I expect Karzai to do everything in his power to pack the jirga with his supporters and exclude, co-opt, or coerce potential dissenters. I expect him to pull every trick in the wily Pathan repertoire to assure a rousing endorsement of his administration, which he will then run up a flagpole and wave in the general direction of Washington DC, hoping that it will call forth a new wave of goodies.

I may be overly cynical, but that's what I expect.