There could be something there. In each case, each person/MP has 0.2 sq ft of space. So, the density is the same and I would expect similar heat per unit area. But the total heat would be more. To keep with the analogy, where I could see issues is if there is only 1 or 2 exits and someone pulls a fire alarm. Then instead of 20 people rushing through 1-2 exits you have 50. Granted, I do not know how many exits there are (AD converters). But, I can imagine that having more exits and putting them closer (i.e. "on chip") would be better.