I can see this. Abrams originally was handling the first film more like a series pilot - he was not expecting to come back and expected others to continue the story. So I can see where he and Kennedy would have plotted the arc of the trilogy. And we know some things were held over from George’s version. I think the course of IX was set during the production of TFA, though the details of the story were up to whoever did it. I hope at some point we get to find out what plot points were set at what time. It would amuse me to find out that some of the plot points in TLJ that people are so pissed about came from Lucas or Abrams.
It has been clearly stated by KK that she threw out Georges plans for the ST. Rj also confirmed that there were no plans at all for the ST moving forward after 7. Its all online. If needed, I can get links.