RCB has some good forign bowling options in Nathan Coulter-Nile, Colin De Grandhomme, Tim Southee etc. Its just that they need to replace QDK who is badly out of form with Parthiv Patel and instead play with a forign pace bowling option.
My Playing XI for the rest of the season for RCB would be,
1. McCullum* 2. Parthiv 3. Kohli 4. ABD* 5. Mandeep 6. Sarfaraz/Pawan Negi 7. Colin De Grandhomme 8. Nathan Coulter-Nile 9. Sundar 10. Chahal 11. Umesh Yadav
Even this line up gives them only 5 bowling options. So they could try out Pawan Negi in place of Sarfaraz. May be at best if Moeen Ali can slot in somewhere it will give them another bowling option. Other than this there are either pure batsmen or pure bowlers in the Squad. Unless they pick some good all rounders it is going to be tough for RCB.
They still have some chance of grabbing some good all rounders in the mid season players trading which will be indroduced for the first time in IPL.