You know how many pieces of art Damien Hurst creates himself Vs his studio assistants creating them under his direction?
For example, of his 1500 spot paintings, he only actually made 5 of them.
It's not uncommon at all for artists to work this way.
He still didn't create the paintings, he offered instructions / feedback to the artists that created them. Whether or not he is credited with authoring them is an entirely separate issue.