I am friendly the 2 terms are generally in direct opposite of one another

a buyback is generally done when a company is financially healthy

and R/s is generally done to reduce the # of shares so that that compoany can once again issue more shares later to raise more needed capital

In an r/s your invesment dollars dwindle and in a buyback your investment dollars generally appreciate

a r/s was certainly in the cards when edig was on its death bed but now that debt is gone and they are profitable I dont believe its in the cards any longer