You've got to factor in that everyone left at the same time because of the evacuation order. You weren't even allowed to stay anywhere within the dock wall so everyone was leaving at once. But on match days many people will hang around drinking or even walking round the plazas, reducing the flow.
Also the congestion around the South stand is because firstly less than half the width was open, and secondly you couldn't walk all the way round the stadium, as we tried to do as the north side was closed, (as was the western terrace), so everyone had to turn back the way they'd come, adding to the crowd in a temporarily narrowed area.
Also the novelty and inquisitive aspect of walking round the stadium will not last long next season as people will most likely head straight to their turnstile before long, especially in bad weather.
