How much reliability do you put into a "friend of a friend" source? A high salt diet is recommended for the following, but the chain of a "friend of a friend said" game ends with someone in Dr. Cole's office saying Rose stretched his ACL graft during recovery which is why he didn't come back this season.
According to the rumor, Rose needs to rebuild the scar tissue around his ACL graft in order to fully recover, but it shouldn't impact his long term prognosis. Presumably, no one within the organization wants a panic over Rose nor does Dr. Cole's office want to take the reputation hit if the news leaked that his star athlete had a setback.
There are certainly plenty of reasons to disbelieve the rumor, first and foremost that no one else is saying it, and I'm not sure I buy into either. I'm also not sure [not being a doctor and all] if this would contradict what we know of Rose's practice/warm up routines. It seems like he'd have had to shut it down in practice if that were true rather than doing all the 5 on 5 stuff he's been doing.
On the other hand, it explains the behavior we've seen from Rose in a way that doesn't end with "Rose is a pussy", "Rose is a malcontent", or some other explanation which doesn't really jive with what we've known of Derrick in the past as well as how protective Joakim Noah was over Rose when discussing the injury [if he had some inside info being good friends with Derrick].
I wasn't told when the stretching occurred, but it might explain why Rose knew there was a good chance he was going to shut down the season in February.
Really, the most believable thing about the rumor is that it reconciles what we've always thought about Rose with the way his injury has played out. The previous circumstances have been frustrating largely because it was hard to understand how Rose could be kept off the court. He always seemed like a guy who would do anything to play.
There's been a lot of animosity built up over Rose not playing, but the franchise still hinges on whether Derrick can make a full recovery. I expect Bulls fans to come out fully supportive at the start of next season when Rose is back on the court winning games for Chicago.