I also think greater could mean "more"
but this was noted
The apostles performed many signs and wonders among the people. And all the believers used to meet together in Solomon’s Colonnade. 13No one else dared join them, even though they were highly regarded by the people. 14Nevertheless, more and more men and women believed in the Lord and were added to their number. 15As a result, people brought the sick into the streets and laid them on beds and mats so that at least Peter’s shadow might fall on some of them as he passed by. 16Crowds gathered also from the towns around Jerusalem, bringing their sick and those tormented by impure spirits, and all of them were healed.
God did extraordinary miracles through Paul, 12so that even handkerchiefs and aprons that had touched him were taken to the sick, and their illnesses were cured and the evil spirits left them
Its implied Peters shadow healed and stated Paul's handkerchief and aprons healed those that touched them.
