Hmm.. and what if Bin Laden and his cohorts have already been caught, and were forced to assist in the creation of this tape? Doesn't it make a bit more sense than Al Qaeda making incriminating tapes of themselves, and those "accidentally" getting into American hands?

No it doesn't.
Bin Laden is a religious fanatic, he is willing to die for his cause, it is much more sensible that he made those tapes to empower his and Al Qaeda's name among the believers.