I don't think Robbie will play as an opener for CSK because I guess he was bought as a backup opening batsman since they already have faf and Gaikwod to open the innings so in case of injury or poor performance may get him a chance or else he will be at the bench for this season.
I don't even know whether this Gaikwad guy will find a slot in the playing XI. Robin Uthappa was in terrific form for Kerala during the domestic tournaments recently. And in all probability, CSK will go for Uthappa - du Plessis combo. BTW, if Bravo is fit to play then CSK will face selection conundrum. They can include only 4 overseas players. So in case Bravo, Faf and Curran are selected, only one among these players can be included: Moeen Ali, Mitchell Santner, Imran Tahir, Josh Hazlewood, Lungi Ngidi and Hardus Viljoen. Can they really afford to drop Hazlewood?