I think it was a good move by RCB to take on 2 of their in form bowlers in Ravi Bishnoi and Arshdeep Singh and others were OK, but the 2 guys mentioned were the major reason RCB had lost to PBKS previously along with Harpreet Brar who wasn't of much threat this time or RCB played out him wisely without giving him wickets.
Also, RCB's turnaround is because of the way Glenn Maxwell played and I think he was the difference in both batting lineups.