In a patient with history of early stage oral cavity cancer and a new ipsilateral neck failure, would you treat the initial site of disease?

In a patient with recurrent SCC in the neck s/p ***remote*** partial glossectomy (R0, 6 months ago), who is now s/p neck dissection for gross disease in the neck, do you treat the surgerized neck only, or surgerized neck AND the initial site of disease, i.e., remaining oral tongue, even though there's no recurrent disease in the tongue. What about contralateral neck?