Depending on location - which seems to feauture largely in Jacen's fights - Katarn potentially solos:
Three Jedi Knights: the younger Horn, the Falleen Mithric, the Bothan Hu'lya. He resisted the urge to snort. Separately or collectively, these Jedi Knights were no match for him.Katarn, though, was a threat.
- Legacy of the Force Fury