When all those heroes were alive even then Vibhatsu could not be defeated. Having Krishna, for his cyes, that mighty armed hero is incapable of being defeated by the very gods!
सर्वैरथ च जीवद्भिभित्सुरापराजितः। कृष्णनेत्रो महाबाहुर्देवैरपि दुरासदः॥