I can't blame Duffy for getting tired of playing the good guy. It's just more fun playing the villain or a less hero-like character like Bobby. But the show needed the white knight so that the whole Cane/Abel structure worked. I can sympathize with Duffy. He was a major player in an international hit show in his prime, and still he was stuck in the same place (there are maby example like Connory's James Bond).
A villain character for example though must be more fun to explore with fewer limits set and therefor more appealing for an actor. If Duffy had played the villain before he left, I somehow think his career would have taken another turn. Somehow iconic villain characters seem to be preferred in other roles, in contrast to the good guys who seem to remain typecast.
Nonetheless it's his right to not like his characters first years - I did not like the last ones, but that was due to the writing only.
From everything I read over the years though, I regard Katzman as the driving force behind the show for better (early years) or worse (last years). I don't think Duffy and/or Hagman (despite having a good relationship with him), had any significant input in the show, let alone the scripts. (David Paulen: Leonard would hire a director and tell him exactly how he wanted them to do the show. Source:
https://web.archive.org/web/2018121...dallas.com/dallasinterviews/davidpaulsen.html)
The writing was poor especially during the dream season. The show should have fired on all cylinders:
- Pam fighting JR at EwingOil with everything
- Jenna (pregnant with Bobby's child) should have fought Bobby's will/Pam with JR helping her
If the writing had not been that poor (except the mostly well-done S9/DVD10)
there would not have been any need to bring Bobby back.
But with declining US ratings and international sales in jeopardy, there just was.