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It's fairly well-known that the Heat were confident throughout James' free-agency process that he was returning to Miami.
According to Jackson, it appears that confidence in part stemmed from LeBron not telling Riley to operate as if he weren't coming back:
Riley said he went into free agency "with the thought he was coming back. I was selling that to players.”
He told LeBron before free agency he would tell players that. “He never said to me, No don’t do that. I went in with that premise and found out on the 10th [that wasn’t going to happen]. We were both very shocked when he did not come back. I was thinking all along he would come back.”
While Riley said he didn't feel misled by James, it would seem the opposite is true when reading between the lines.
"There wasn’t anything in that meeting that told me that wasn’t going to happen [that LeBron was going to leave]," he said in reference to a July 9 meeting with James.
Still, Riley mentioned that LeBron was not responding to his texts and emails, so there were certainly signs James was heading elsewhere.