Is Tawaf from the second floor sufficient for those who are excused, or is it necessary to have a deputy? And is it a condition to precede and delay the Tawaf around the Kaaba?

Answer:

For those who are unable to perform Tawaf around the Kaaba, as a precaution, they should perform Tawaf from the upper floor and have a deputy perform the Tawaf, and neither of them is a condition to precede or delay the Tawaf by a deputy.