Onasi is never listed as having had a wife after Telos, especially considering his son died.
His personal story in KotOR involved saving his son from the academy on Korriban. If lightside Revan is canon then Dustil should still be alive. Plus I wouldn't mind if they modified canon a bit to see another Onasi. I'm also sad that they didn't have the Onasi blaster as a legendary item, or Bindo's robes.