Uhhh...no. This is not what happened. Most likely he tweaked something in his knee that he couldn't run through. Ever go for a jog and have a kink in your leg that prevents you from running to your fullest? Bet your kneecap wasn't fractured. The X-rays coming back negative doesn't mean something wasn't wrong during the race.
This is not to say I think he would've beat Arrogate. I don't. I also don't think the trip or early fractions had anything to do with CC's performance. Something was physically amiss with him. That's all.