Thinking about it, they need to remove eight bolts per section, then the section itself, then eight bolts for the next section, and so on. I could have expected

Thinking about it, they need to remove eight bolts per section, then the section itself, then eight bolts for the next section, and so on. I could have expected them to save time by removing the bolts of the second top section in parallel to the supporting crane removing the top section, but removing the bolts of all sections only makes sense when the supporting crane is actually faster than the bolt-removing guy/team. Something else might be going on -- maybe they did not want the workers who were removing the bolts to wait for the supporting crane and sent them home to save on wages or gave them other work to do.