Yea, I think Chin had concern about Gotti, not fear. The sit down they had, in which Gotti brags about making his son, and Chin goes "I'm sorry to hear that", then basically moves on to the next subject. Anyone who feared Gotti wouldn't have spoken to him that way. All of Gotti's guys kissed his ass, they worshipped him, Nicky Scarfo had some sort of bond with the guy because they thought alike, the Chin was his complete opposite, and he knew it, I think he felt that in so many ways he was the superior human being to John Gotti, at least a superior mobster anyway. The Chin was of a different breed, I think he was as aware of that as those around him.