"No doubt we lost a great player," Riley said of losing James. "I don't get hurt. ... The hurt didn't last long. We picked up the phone and went to work. Sometimes, things happen that you don't like, but you have to move on. I feel really good about where we are right now at this moment. I feel we are up to the challenge and will be as competitive as anyone in the Eastern Conference."
Riley addressed several questions about what transpired in the initial days of free agency, from the moment James opted out of his Heat contract leading to the final face-to-face meeting between Riley and James on July 9 in Las Vegas. James had met with Cleveland owner Dan Gilbert in Miami days earlier, but Riley suggested he still didn't get the impression James had reached a decision from their conference.
But Riley also said he sent several emails and text messages directly to James that weren't returned.
"I don't think I was misled," Riley said. "I don't think I was encouraged, either."
Riley scoffed at the notion that he may have offended James shortly after the Finals with a series of strong and challenging comments he made to reporters after his exit interviews with Heat players. Riley opened that news conference last month saying he was frustrated and implored his players, without naming names, to have the guts to avoid walking away at the first sign of adversity.
Riley said Wednesday he was speaking out of frustration from an embarrassing performance in the Finals against the Spurs and did not direct those comments specifically at James. Riley denied that he had any indication or feeling at that time that James may have been thinking about leaving.
"My message that day was borne out of just getting beat against a great team by a total of 70 points in five games," Riley said. "We got our (expletives) handed to us. I was upset, and you should get upset. That's sort of how I reacted. It wasn't about making any direct comment to one player because everybody on our team was a free agent at that time, or about ready to become free agents."
During an interview with ESPN.com after agreeing to his deal earlier this month, Bosh said he was initially surprised by James' decision to leave after their success in Miami. But he also said he's confident with the Heat's moves this offseason and believed the team will continue to contend.
"That will never change," Bosh said of his time with James the past four years. "As you move forward, you appreciate those moments and keep going forward."
After four years of success, Riley said a potential dynasty in Miami ended prematurely. But he looks forward to putting together another dominant roster in 2016 when several marquee players, including Kevin Durant, are set to become free agents. Bosh and McRoberts are the only players the Heat have under guaranteed contracts beyond the next two seasons.
Asked if he was ready to make another big free-agency splash in two years, Riley, 69, answered "yes."
"It's fired me up," Riley said of dealing with the emotional highs and lows of the past month. "I don't like to get beat in anything.
"This process didn't take anything out of me. That chain has been broken prematurely, but we're going to try to make it a generational (team) again. We were always looking at 2016 to be a (major) player (in free agency)."