no doubt the West Indies team won a single T20 match against South Africa but remember this will be a test series of matches and not T20. You need more technically sound players to win test matches and West Indies team lack it. Most recently they have lost a test series in a bad way. Even when they have chance to dominate England, they fail to take control of the match and instead they panic and lost.
I do not say that South Africa team will be as strong as England but still since it will be home ground for West Indies, it will be even more pressure on WI to perform better.
Check the moral of South African Captain
Temba Bavuma by his statement:-
"It's a challenge that's not necessarily unique to us and probably something that all the teams outside the big three face. It feels like we're starting again and again as a team," Temba Bavuma, South Africa's Test captain said in Johannesburg.
In last few years, we are having serious changes in game and West Indian downfall is on course as we watch them in last series against England, but now they are playing at home against a team which are already facing too many changes on domestic level for their survival even they are having quality, but their system is discouraging players to do things which are bringing them down.
West Indies is now needed to do revolutionary changes if they want to survive in cricket they are already having lack of consistency and quality is also badly down this series is going to be important for them because in case of lost things will be gone from bad to worse which are surely not good deal for their survival in game and in this format.
In last series against England we have some depth into their bowling, but their batting is having no technique which is important while you are playing against quality teams in any condition.