Honestly, IMHO none of the wild cards barring maybe a Vikas Gupta have any probability of winning Big Boss. Some of them are to up the comic value, some of them to annoy, some to try and icnrease the hotness quotient but most are here to further the case of existing BB inmates.
We had reached the top 4, but in the minds of viewers there was no compelling winner, or a rivalry between two yet. Rubina has fan following, but has been non existent parts. Jasmine has a ugly mean side which most of her fans have seen and detest from voting for her, Abhinav is well whatever Rahul used to call him with no chance of winning the show, Eijaz has done well on the show with tasks etc but doesnt have all viewers rooting/voting for him yet.
So the role of all newcomers is to create a sympathy wave for the older contestants specially the bahus, get the two bahus to be much more visible, perform in tasks and create intense friendship/rivarlry between JAsmin and Rubina or even Eijaz so that in the actual finale, people want to root for them. The new guys are just side actors who will torment the old guards to ensure the bahus at least play the game. So the eventual winner of the show will be Rubina Jasmine or Eijaz. Abhinav i dont think has any chance and the new pappu side actors will just be needling them and acting in the house