There are a number of players who could be better than RNH down the line but for now he is the 2nd best player on the team. Draisaitl, Puljujarvi, Klefbom, Larsson could be there soon but not yet. Davidson and Nurse still have the potential to be top pair guys too if they keep developing, although both are more likely to top out as #3s.
With Hall and Schultz gone, and if Eberle plays with Lucic maybe that provides the motivation and protection needed for Eberle to return to the form seen in his 2nd season. If that Eberle comes to play then he's pretty impactful too. We've seen many flashes from a number of players on this list, who's going to start consistently playing at that high level?