Then again you need 4 overseas players. Chawla and Bajji are not there so i am not sure if they going to opt for 2 overseas opener (Faf-Roy). Faf,Curran and Bravo(if he's fit) seems fix. They should go with the another overseas bowler in the squad, on spin track Tahir/Satner and on fast may be Hazelwood/Ngidi.
Last year, there were some rumors regarding the increase in limit for overseas players from 4 to 5. But I haven't heard anything on that subject recently and it looks like the limit is going to stay at 4. I agree that du Plessis and Curran seems to be permanent fixtures. But I am not that sure about Bravo. His form has declined recently and he has gone through serious injuries. Gaikwad may get a couple of outings, but if he fails to perform, then he'll be dropped. Tahir is around 42 years old, and I am not sure whether he'll be fit enough for IPL 2021. For the pace department, they have promising Indian players such as Shardul, KM Asif and Deepak Chahar. For spin also, they have Jadeja and Karn Sharma. They may need only one overseas player for the bowling department.
The clear picture will be available only after February 11th, after the auctions.
Bravo recent decline is because of fitness so its understandable. Tahir is old but he's very much fit to play in T-20 format.