As for the use of double katar, there are statues in south India that do depict warriors with a longer, Vijayanagara type hooded katar, one in each hand! But these do offer a lot more protection than the simplified katar that got common later.
I personally think that the later katar developed the way it did for ease of carrying as an everyday item and backup weapon that one didn't expect to use a lot, whereas the Vijayanagara hooded katar (and pata) seemed to have been primary weapons.
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