I assume he left due to Guru’s toxic workplace environment and doesn’t wanna get the same fate as Bastien, I had assumed that Guru was responsible for killing Bastien.
Yes, I understand that directors do not control scripts, but even then, being a director is a tough task to do, and I think that American and Canadian pipelines have different views on directors and showrunners. Where as in the US episodes usually have different directors supervising with the showrunners having the creative control on how the script should be envisioned, directors in Canada likely act as the showrunners instead, thus allowing the show to keep a consistent quality rather than having different directors supervising each episode,
