A person familiar with the discussions put it this way to CBSSports.com when I asked where the proposed deal stands: "On the health of J.O.'s knee."
The person, who is directly involved in the process, confirmed that the Heat and Raptors have exchanged medical information on O'Neal and Marion -- usually the final step toward completing a trade. Marcus Banks also likely would be going from Miami to Toronto to make the deal work under league rules.
Riley, speaking with reporters after Mourning announced his retirement, essentially confirmed the talks.
"I value Shawn Marion immensely," Riley said. "He is a tremendous player. I'm sorry this is going on right now, but that's the NBA business."
If O'Neal's ailing right knee is healthy, he could help bring the inside presence that Miami has been lacking-- especially defensively. His $23 million contract coming off the books after next season also couldn't hurt in the bid to pair Dwyane Wade with a major free agent. Marion's $17.2 million contract expires after this season, allowing Raptors G.M. Bryan Colangelo to make a pre-emptive free-agent strike in an effort to pair and All-Star with Chris Bosh.