Yeah, seemingly he was losing the last few kilos and he got a call that his girlfriend had gone into labour early, went to the hospital, then was up on the morning of the fight - I'm sure you seen the video - cutting weight and had to stop.
I don't think he went into Chiesa mode and said it was 100 per cent the reason why, but he outlined that there was an emergency and he had to attend to it. If you remember, he wasn't at the press conference in Vegas for a family emergency, but not sure if that had anything to do with his kid/girlfriend.