I don't see his quality as being close to Alves or Bales.
He won't ever be a threat as big as Bale sometimes was, and he won't ever dominate the whole flank as Alves could. He won't be as reliable and good at combining as Sergi Roberto either.
He can play on the side of the pitch from a slightly deeper or a more advanced position and be an okay player both off/def. With another central defender behind him, he should be very free to move forward in the current formation, I think Barcelona could make use of a player who is a bit better at attacking than Dest in that position to be honest.