I'm not a DCC user, but in either DC or DCC the more 'droppers' the merrier - on my layout (almost) each section of track has a dropper so I don't have to worry about connectivity relying on fishplates only.
For DCC it might depend on whether you have electrofrog or insulfrog points as to whether power is available in the sidings at all times - I'm sure a DCC expert can advise.