First of all, it is very odd that they went with a 4-match T20I series. Either it should consist of 3 matches, or 5 matches. Anyway, the third match is scheduled to take place at the SuperSport Park in Centurion. And historically, the pitch at this stadium has favored pace bowlers. And as we saw during the last match, South African pacers are in really good form (especially Gerald Coetzee, Marco Jansen and Andile Simelane). On the other hand, the two Indian opening bowlers (Arshdeep Singh and Avesh Khan) failed to impress. For how long Indians are going to be overdependent on spinners? And that too in South African tracks.
In the last match, the Indian batsmen openers failed to make the good runs and to set the good target in which they would get the hope to win the match. But in the first match, Sanju Samson performed amazingly but in the second and the last game, no Sanju, no any other player from the Indian team. Gerald Coetzee, Marco Jansen and Andile Simelane has not did even much good bowling, as you mentioned them specially, the each just took the one wicket that was their responsibility as the bowler, I don't think they did have the performance in which they should be specially highlighted. However, they made a good effort not to give runs and restrict India to only 124 runs.
. For the future, I'll Wait for hashtags of #JusticeforSanju if he gets dropped. 
