In a start after the safety car the cars become naturally spread out due the unpredictability of when the lead driver actually make the break and goes for it. In fact this generally has a knock-on effect down the 'grid' and each following car can only react to the car in front. With a rolling start, the race starts when the lead cars cross the start/finish line so they will be generally be bunched up more closely together & still like that when they arrive at the first corner.
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