It's correct that I'm the blue/orange car. Greg's analysis of Marc's vid is also spot on. And yes, I had a conversation with Denise in which I apologized - and said I felt like I was just holding a straight line. She said I got into her. I accepted that version and reiterated my apology.
But then a fellow competitor said HE thought I was just driving straight, and the guys at the shop say that's what my vid shows (I haven't yet seen it myself, but will today). So in my mind now, Greg's 3 possibilities still exist: 1) I moved right and touched Denise; 2) she moved left of her own volition and touched me; 3) she was forced left and touched me.
Here's the lesson for me: watch as much video as possible before assigning or accepting blame. It's common sense.
Note that regardless of who moved where when, I DO feel rotten for my fellow competitors.