So somewhere there is a post on the fact that because Renarin is bonded with a corrupted radiant spren he is actually using Voidbinding to see the future and because of this he is seen by the voidbringers as an ally
"As he approached the ramp up to the Oathgate, the Fused descended. Four landed on the ramp before him, then gave him a gesture not unlike a salute," Oathbringer Chapter 120 Renarin POV
This essentially makes him ,and i am going to coin this term, a Voidknight. Hopefully we will see what impact this has on the series in later books hopefully by infiltrating a Fused camp.