Siavash just manipulated the entire house
 

He knew how Rodrigo would react, when he told him that he didn't nominate. Then he watched all the housemates make themselves look like idiots while he sat back and watched the chaos. I have to give him credit, he's smarter than I thought.

Well done. Least somebody can see what's going on here. He wasn't happy with the fact he'd be up against Marcus so he decided to mention it to Rodrigo in an attempt to cause a bit of madness, with him in the centre of this storm.