Vergil comes across something that no other person, passage on king Evander, " No idle superstition, or ignorance of the ancient god, forced these solemn rites of ours this ritual banquet this altar to so great divinity upon us. The other two people never talk about it.
Vergil comes across another thing that Livey and ovid talk little detail about, " there was a cave here, receding vast depths untouched by the suns rays inhabited by the fell shape of cacus. Livey and ovid just say that he went into a cave they didn't go into detail about it.
Livy is the only one that goes into Romulus and Remus and he said, " Remus is said to have been the first to receive an omen: Six vultures appeared to him. The augury had just been announced to Romulus when double the number appeared to him."

2. Vergil comes across that Cacus went through the vast cave,