His head always stays in the center line, whether he's throwing punches or not. Look at how many times he got tagged clean by Kevin lee on the feet because of his lack of headmovement. You can't do that against an explosive powerhouse like chandler. Oliveira also stands very tall and has a very high guard, which makes him very susceptible to body strikes. As shown in his past fights. And chandler is one of the best at attacking body in 155. Overall this is a very tough matchup for Charles, If he hasn't fixed his glaring holes in his defense then I don't think he can get out of the first round.