I should also note that the “backwards” sword grip used by Ahsoka in TCW and Starkiller in The Force Unleashed game is something used by Zatoichi, the blind swordsman protagonist of a famous series of jidai-geki movies.
Normally real combatants would only use such a grip on occasion, as it increases grip strength at the expense of flexibility and range. It’s not something people would use all the time as a standard grip. But as a blind man Zatoichi probably uses it so the sword doesn’t get knocked out of his grip. Ahsoka has no excuse.