I'm not sure I completely understand this reasoning.
If Steph had been up for nomination it would be her that would be leaving. If anything she is more unpopular than Nush, even before this week.
There's no way Scott and Ray would have figured in the nominations. Cameron was guaranteed to be in the final week and the final was always going to be between him, Scott and Ray.
And the look on Jon's face if Cameron stays is not a reason to evict Nush. To me, more and more things that Jon is saying are starting to make sense.