lets say the CX251 blocks on at 0500, by 0600 it has been deplaned, decatered etc, would get towed remote, say 30mins, then may be preloaded with fuel whilst remote, cleaned, security checked, maybe even catered and would be towed back to a departing stand at the latest 90mins prior to departure, fuel finished, catering finished, bags and pax loaded and departs as say the CX250 around 1830.
Departing from a remote with a full load will inevitably result in a delayed departure.
This saves the cost of parking on a stand fees of around 9hrs or so, which is far in excess of a couple of tows and a remote parking fee.