When you say you would take a fight in a "heartbeat" you are saying you would take the fight without even thinking about it. You are saying you would take the fight wherever whenever. Yet he couldnt take it on 8 days notice after doing a 3 month training camp. That is the most B**** reason i have seen a champion pull out of a fight.
Jon probably thought it was a ridiculous fight and there would have been such to low chance of it happening that he went with the popular answer and said he would take the fight. So he lied...whats new?