Quite possible that there were staff shortages, particularly if a few flights were arriving at once.
In regards to the disembarking procedure, the 737 cannot bet boarded or disembarked from the rear only, as there is a high risk of the aircraft tipping on its tail with the weight of all the people moving towards the back, and no weight in the front. The most likely reason they kept everyone at the front for 5 or 10 minutes, was so the ground crew could unload all bags from the rear hold, thus reducing the tail weight, allowing the remaining passengers to exit through the back.
Cheers
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