That was way before he had a kid, he only had his kid after ufc 200 this was between ufc 194 and 196
Oh hello! thought you were ignoring me. Hard isn't it to ignore me, I'm like your very annoying auntie.
Still if it wasn't a baby it could have been a lot of things, idiots in the gym during the day, publicity engagements, burn out, depression, basically anything. If he'd lost his 'work ethic' then he wouldn't have turned up late at night, who does that unless they really want to train. Life can make people crazy at the best of times, a life as a fighter even more so.