Yes, there was a discontinuity, and a fair bit of that was probably down to the lack of Swarb - the last couple of albums had gone back down the 'trad. arr.' route, and without him on board Simon, Peggy and DM took it away from that again, and followed their own musical interests so that there has been very little of that in the past 40 years, and a lot more songs from Ralph, Steve Tilston, How Williams ,etc, etc, and subsequently from Chris.
Yes, Ric has a very different style, and as one who came on board with the Gladys line-up, he was what I have always been used to. And he has calmed down (or been calmed down, as he says in the interview) over the years from the days when he would go very 'cosmic' in his solos. I don't know quite what happened with Simon's singing - whether he had some lessons, or whether his voice just matured - but it certainly improved to the point where he was happy to be the main vocalist.