This information came from my sources in regards to Eddie Guzelian (original RPM EP)'s termination.
Eddie cared deeply for the show, the cast members, and the audience. He acknowledged the fact that PR has an older audience and he wanted to target to that. He was hired by Disney to change the show and deal with the challenges with those that wanted to keep the show the same. One of the crew members was upset with the changes and convinced Disney to fire Eddie.
Disney has definitely shown a very unprofessional process when it came to the new EP. They basically showed great support for his vision of the show and let him go after he wrote a decent amount of episodes.
Disney never asked Eddie how the season, story arcs, or character developments were going to end. He would've given that information for free to ensure the show's success. Eddie's final episode will be 1718.