RCB gets Travis Head. Poor fellow. He will be sitting in the bench for most of the matches for sure.
I don't think Gayle will play all matches this year. He is a great T20 player, but his fitness levels are going down and down year by year. Last year, RCB lost some matches because he couldn't rotate the strike while settling down and that was something that made difference.
With the entry of Watson, I definitely feel Gayle will not play all the games and RCB will not be over dependent on Gayle. In fact, entry of Watson will ease the compulsion to make David Wiese play too (as a bowler).
We may see a line up on these lines:
Shane Watson
Chris Gayle/Sarfaraz Khan
Virat Kohli
AB de Villers
Mandeep Singh
Stuart Binny
Sarfaraz Khan/Travis Head
Mitchell Starc/Adam Milne
Sreenath Aravind/Harshal Patel/Abu Nichem
Varun Aaron
Yuzvendra Chahal
If the bowlers in bold turn out really terrible, we need to compensate them with an Indian batsman to rest Gayle and allow two OS bowlers. It would have been brilliant if we have 2-3 local batsmen, that would accommodate both Starc and Milne to play together.