He has proven to be very productive in the Premier League, unlike Werner. I suppose it's just whether he can still be as productive outside of City. He will always have that clumsiness in his game.They already have Werner to earn a load of chances with his pace and movement before inevitably fecking the majority of them up.
Sterling is the same player with better dribbling. I'm not sure what they need him for unless they're on a mission to be the most wasteful team in the league.