__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
What little we've seen of Kol paints him as a stone-cold badass, kicking aside Nihl and taking a pile of sith to distract him enough for Nihl to blast him in the back.
A guy that fell to pre-prime Ulic is not going to fight that.
Because that's about the only fight of his we've seen. We know he's a badass Skywalker, but other than 'notably above Nihl,' we don't have precise information on him.