At face value, Nikitin's play last season and this pre-season was not enough to keep him in Edmonton. On the other hand, he accepted his assignment to the AHL like a professional and played relatively well in Bakersfield. That is typically what you want a coaching staff to reward, if an opportunity presents itself.
Best case scenario - Nikitin has put in the work and shows the effort to be a 6/7 defenseman.
Worst case scenario - He ends up back in Bakersfield. I guess in this case we hope he doesn't cost the team any games when played on the Oilers.