He's up... whats not to get about that? He wanted up for nomination he got it. He thought David would be up aswell but he could have easily voted for David instead of not nominating which would have meant David was definetly up and there being a chance Siavash wouldnt be up at all.
If he was a gameplayer wouldnt just voting properly this week be his best bet. I have seen your theory and its so far fetched its unbelievable. Nominating as normal would have been so much simpler and guaranteed him a place in the final week.