My first question is how did the rumor get started?.
I see three ways:
We did get him, and our guys had loose lips or
We did get him, and our guys have been silent but OBL's guys got concerned when they couldn't contact him and started the chatter and rumor or
We didn't, are trying to flush out the rest of AQ by watching them squirm and shake while THEY try to discern the truth.
I think OBL (or maybe his son, since OBL is dead since Dec. 13, 2001, Tora Bora, and their voices are similar) went tele-silent - this rumor seems to have more roots/origination with the Arabs than the US. I think THEY'RE missing HIM.