RE Sisko's Runabout... Is there anything in season 7 to suggest it's what he came to Earth in and it's just been sitting in the Star Fleet long term car park for three months?
I'd have assumed he came to Earth via other means (or if he did come in a DS9 Runabout it would have been either sent back or put into the general car pool), then when he had his big vision he went through usual channels to hire a Runabout for an Official Mission (possibly using a bullshit reason so as not to get refused on grounds of being a crazy man. Maybe claiming he needed transportation back to DS9? Or even getting Dax to requisition it on some spurious reason?).