Sympathies, this speculation is so hard, isn't it?
When we applied to secondary for ds we made an application under special circumstances criteria (complicated story, but the school had changed the admissions rules in a way that disadvantaged ds, and we argued for consideration on compassionate grounds). We had supporting letters, so had a good case but I was still very jumpy. We bumped into the head of the secondary school about a month before the results came out (we know him vaguely through mutual friends and primary school etc), and he made a point of going up to DS and shaking his hand to say hello. It was very friendly, but unexpected enough to make me do a double take, and I did suspect there might be a hidden communication going on.
Suffice it to say, I was right.
Hopefully you'll get the school you want, but I'd be really surprised if the primary school will admit to anything at all, for fear of setting off a stampede.