prescott city attorney jon paladini claims sole survivor brendan mcdonough heard an argument between the crew leader and his deputy .
paladini claims mcdonough told his secret to former city fire chief darrell willis .
willis admits mcdonough came to him to ` get something off his chest ' but says it was n't about infighting that occurred before the tragedy .
mcdonough has also denied the accuracy of paladini 's account , but reports of it may alter lawsuits stemming from the tragic june 2013 fire .