Now I find this interesting, when is a sith dubbed with the mantle of 'Darth'?
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When you become an apprentice I think. Anakin became 'Darth Vader' right away right?
EDIT: Just remembered something you guys may or may not know...
Dark Lord of the Sith
DAR + TH = Darth!
...Have you even played the games? Both give you the option to be DS or LS. Even though in the first one you had to go to the Jedi Acadamy on Dantooine, they gave you the option to lie to the council.