With their current personnel they seem to resolved their issues at the back. Whether he deserves any credit for that is perhaps debatable.
To the earlier point about Lampard and Gerrard, obviously they get opportunities because of their performance on the pitch, but they also had nearly two decades each as players to demonstrate their leadership, communication skills and potentially football IQ. Obviously not all good players make good managers (regardless of sport), and it remains to be seen if they will, but I'm not surprised players like them move fast as managers and receive the benefit of the doubt.