I don't know what statement you refer to, unless it is the one where he says that the later years of Dallas were ones where they had lost perspective of what makes a good story. I don't think he's wrong about that (hence my puzzlement over the atavistic worshiping of Lorimar which allowed the show to deteriorate). I agree that Duffy is a little too quick to please the hand that feeds him at any given moment, but again, I don't think we should hold thee actors to a different standard than any employee in any other industry. And again, would he need to bring any disagreements in common view? If not, how would we know?
I'm referring to statements Duffy made in various articles and on various talks shows while TNT Dallas was on the air. I'm paraphrasing, but he said things like "this Dallas is as good as or better than most of original Dallas." Another time, a talk show host said something like "Dallas is bigger and better.... well, I don't want to say better." Duffy responded by saying "No, it is better!" Other times, he said Cidre's pilot script was the best Dallas script he'd ever read, he mocked the men on the original for being "swashbuckling" types, and so on.
Again, I don't expect an actor to bash their show in the press. But Duffy wasn't just being a good employee, he was being a brown noser.
Also, if I had information that would help my boss be better at his or her job, I would share it with them. If they declined to act on my input, obviously that would be their choice.
Lastly, I personally don't worship Dallas's later years. I never have, but Cidre's Dallas was a mess all its own. Larry and Linda never praised the new Dallas at the expense of the original.