According to Filoni, they were originally going to use a vibroblade, but Lucas changed it because "there's no way that a non-lightsaber could block a lightsaber". 
Oy vey. ( Recall ROTS much? )
Filoni didn't say anything about TOR.
It seems noteworthy that in the KOTOR games vibroblades blocked lightsabers all the time.


Filoni didn't say anything about TOR.
It seems noteworthy that in the KOTOR games vibroblades blocked lightsabers all the time.