So if CR wins this result he's ANC prezi? From there SA prezi?
Yes and no..
Yes, he is the ANC president.
No, he will not be president of SA unless he recalls Zuma and only wants to serve one full length term. Alternatively he waits till elections 2019.
Personally I suspect Zuma will be recalled (corruption charges being reinstated with Shaun the sheep gone) and a 3rd party made president for the period till elections (not the newly elected deputy). If this happens expect a cabinet reshuffle and Gigaba being gone before budget speech.