The only canon use of two handed light sabering is when Annakin used Ataru against Dooku in the movie with two lightsabers.
Niman is part of the Consular Class which means its highly unlikely to get a two light saber spec or Signature ability.
Asoka uses two sabers in Rebels. And there was a lot of two sabers in oyher canon until canon became legends. Why are so many people up in arms about two weapon fighting.