Had Raina, maybe CSK's team would have been more balanced. But not having Raina is not a big problem. The current team combination has been much better. Players like Watson, Ambati Rayudu, Faf Duplessis, and Ms Dhoni can turn the game around at any time. So I don't think Raina will have much of an impact on the team.
I don't know whether Raina could have made a big difference. The main problem with CSK is that they have a squad where the average age is close to 35. This will definitely have an impact, when they need to step up the momentum. I can understand CSK including players such as Dhoni and Harbhajan in their squad, as they are legendary players. But what is the point in giving so much importance to players such as Kedar Jadhav?