Like people have already mentioned, Colors will be blamed regardless of the winner. They won't come clean with their votes ever because then they will be limited in creating drama.
This happens year after year where the channel is blamed and bashed by fans of contestants and questioned in the social media. However, it doesn't matter to them because once the competition is over the chaos will remain for a few days then die down. All the fans will not watch JDJ again but the next season will reel in another batch of fans. Therefore, Colors never has to worry.
Also, let's not forget that most people watching JDJ are not connected to the internet world or IF so they don't know about Colors' rigged ways. Even if they do, they watch it for purely entertainment and don't care. Others watch it for Madhuri, Remo etc.
If Shakti wins, fans will say that she is trained and shouldn't have won. Colors will justify her winning through votes.
If Mouni wins, people can claim that she wasn't the strongest contender. Colors will once again justify this by votes and her scores.
If Ashish/Tacker, win, once again Colors can just blame the fans and say they voted hence they are the winners.
They will have a justification for it all because let's remember that they are running a business. They have lawyers, spokepersons, etc to cover and make up whatever bullshit that gives them the clean chit. It's happened before and it will most definitely happen again.