By being so evasive, Dana fuels this type of speculation. On one hand, Dana says Brock had every conceivable test done on him. Then, he says they need to get Brock to a good hospital like Mayo. And, since when did Dana get his license to practice medicine? How does he know Brock will be out for a "long, long time," yet, not know exactly what's wrong with him.
It's just shady, which isn't surprising considering we're dealing with Dana. Could you imagine a star of a mainstream sport like Baseball or Football being sick and the GM saying, "We don't want this made public"?