What if it's neither revan or nihilus?

I often hold my phone, wallet, book, keys, even knife in my left hand despite being right-handed. Holding a lightsaber in your non-dominant hand means nothing, really.

*Edit* Of course, that assumes it is in the left hand. I personally see the cropped image as having been frontal, meaning the lightsaber is in fact in the right hand. Also, Nihilus is often depicted with his lightsaber in his left hand so he can channel force powers through his right hand.