The page from Fasti that I posted says that Peter Cameron Black was minister of New Monkland from 1864 to 1894. As parish minister he would have lived in the parish manse.
Thomas Wilson was minister of Calderbank, which was disjoined from Old Monkland some years after his incumbency. He was not 'The Minister of Old Monkland' so he did not live in the parish manse of Old Monkland. He was minister at Calderbank from 1867 to 1869, when he was translated to Lesmagahow.
In the 1871 census Thomas Wilson, 32, minister of Lesmahagow 2nd charge, born East Kilbride, was a visitor in the household of William Shearer in Old Monkland. He was accompanied by his wife Elizabeth, 28, born Rutherglen.
As Sancti says, the name of the officiating minister, if it was a regular marriage, is always recorded on a marriage certificate.
Perhaps Rev Wilson, as minister of a subsidiary kirk in Rev Black's parish, was standing in for Rev Black while Rev Black was ill, or away from his parish.