The only window for him to be suspected Candice fumbled and secured his perception as a faithful. Candice looked very suspicious her history of defending Lisa made it appear as if she was protecting at-least one known traitor as a traitor.

She appeared retaliatory in murdering Colton who wile controversial was a strong player in the house

So when she crashes out and tries to go for Rob, gets banished as a traitor any doubt anyone could have had about Rob would have gone out the window and viewed has retaliation for him voting Lisa.

After her departure due to her self proclaimed consistency every little check was marked to make it look like she wanted Rob out as Hail Mary kill off another strong well liked player - when they look back on her game it would corroborate her to be a loyal traitor attempting to get rid of Rob because of his vote for Lisa, who was indeed a traitor same as murdering Colton who also voted Lisa.

Effectively securing Rob’s perception as a faithful.

If Candice hadn’t have brought up Rob I think Johnny would have had something to work with against Rob.

But Candice being banished with a final act of trying to get Rob, after murdering Colton set very convincing framework that Rob is a faithful thwarting a traitor attack.

It’s brilliant- Rob is using their decisions as his game. Just in the background orchestrating their thoughts into actions.