Webber very much had a chip on his shoulder about the team, I remember reading something on James Allen's blog after his first ever win in Nurburgring, where it seemed like the team was acting like someone had died (behind the scenes) instead of being over the mood or ecstatic.
Whether or not you think Webber was worrying about nothing or had genuine concerns is open to interpretation. But it's over now, it's the past, it's history.
With Dan, he has a likable personality, doesn't whinge about anything (so far) and his driving has done the talking. From the first practice session in Melbourne, the wet qualifying, through every race until now. The only faults (being harsh) are a poor middle stint in Sepang (before the pit problem), and an average Austrian race. Other than that, he's been very solid in pretty much every session or race. Regardless of wins or not. His racecraft especially has been brilliant. Beyond anything Webber ever did (Webber was good at times too) but especially given how early it is in his career. Even Seb has some problems in his early RBR days until he ironed them out in the last few years. Ricciardo so far has been solid or brilliant depending on the race, but I don't think that says bad things about Webber necessarily. Different stages of their career, and there are a lot of drivers haven't been as good as Ricciardo this season, because it's been a surprise to see how good he can be so far. The question is whether he can maintain it. Because it's a high level trying to maintain it but he has the right attitude and there's every chance he could become even stronger. He has the right attitude of being competitive but not taking it too seriously. Horner especially can't stop raving about how relaxed he is.
To the very least he has justified his place in the team, and regardless of what you think of Marko.. he seems to be well liked within the team. He's a hard person to dislike. How long will it take until something bad happens and he has to face an awkward moment? Rosberg and Hamilton were 'friends' but 6 or 7 races later, there is a huge tension. It's hard to be nice or 'friends' in such a competitive environment. It's nice to be a 'gentlemen racer' but in the end, it's about being the best and about winning. It's not about trying to win a popularity vote, it's about driving cars as fast as possible and finishing ahead of everyone else.