Have you now determined that you need to consider this is business activity, and there needs to be a Sched C for that 1099-Misc person? Remember a 1099-Misc is informational reporting; was he in business and if so, you need to know about all the income and not only the amount someone reported on 1099-Misc. If he made $2 million, but no one paid him $600 or more, there would not be any 1099-Misc income reported. But you would still prepare the business activity as Sched C.

It seems you need to ask this client for more details.