That is the beauty of CSK. Fleming and Dhoni always target the all rounders. If one has a bad day then we could easily go with the other option. And RCB always lacked the same in the past 10 years. They just go with 5 or 6 bowling options.
Mark Wood is a must to support Bravo at the death overs. But at one stage we would need an attacking leg spinner so he could come in place of Billings or Du Plessis by adding Rayudu or Jadhav.