There is quite a bit of picture evidence that Joe Biden is not Joe Biden. I don't know what the truth is, but the evidence is very compelling.

That aside, if we assume that Q et al are really in "control," as they state many times, there are really only a few options to rectify a dementia patient as Resident.

1. Q et al are the real Resident Joe Biden's handlers (a real dementia patient).
2. Q et al are the handlers for the handlers of a real Joe Biden dementia patient.
3. Joe Biden is an actor, put into place, to act out The Show, as suggested by Q ("what makes a good movie?", etc.).

Just because no one has come out and stated explicitly that Joe Biden is an actor, doesn't mean the writing isn't on the wall in big bright neon letters.

From there, it follows that somehow Obummer is also controlled. I am not convinced that he was "dispatched," but if we assume that Q et al really are in control, then he is controlled somehow, thus "dispatched" is almost certainly close enough to the truth as makes no nevermind.