Ben Stivers would've turned out to really be Jock. Clayton was only missing so that it would set up the scenario of Miss Ellie walking into Ben's bunkhouse and finding Jock's belongings. That scene got re-played in season ten with Wes Parmalee, it would've made a great end of season cliff hanger. A shame the Ben version got cut
Mark Graison I think was going to be killed off, leaving Pam with some of his fortune and possibly Graisco his company. Sue Ellen would've been in a wheelchair as a result of the explosion in JR's office and possibly blinded as well. Jamie would've been dead of course. Jack would've had more to do with Duffy not coming back. With Duffy's return most of the plotlines for the next season bit the dust save one, Steve Forrest was still under contract so Ben Stivers became Wes Parmalee.
Could Dallas have survived without Bobby Ewing? Season nine started very strong, Sue Ellen's alcoholism storyline is a highlight of the season, Linda Gray is terrific. Whether its true or not Hagman apparently was not a fan of the women taking the lead in this season. Both Victoria Principal & Linda Gray had major storylines this season. I certainly think it was a strong season. Whilst I liked Patrick Duffy's return, I was more enraptured by Wes Parmalee's claim that he was Jock as I fully expected the writing to reveal that he was Jock all along. I was frustrated & disappointed by the way Wes just left. Duffy's return messed the Parmalee story around and ultimately stopped Steve Forrest from staying on Dallas as a recast Jock! Right, I'll stop talking about my favourite storyline!