The Watchtower says that in the first century all Christians were anointed. This is interesting because the place where we get the number 144.000 is in the book of Revelation. It was written by the end of the first century. And according to scholars, by that time there were already around 500.000 Christians.
So if the Watchtower is correct and all first century Christians were anointed, the 144.000 anointed were already fulfilled 3 and a half times over by the time the number is even mentioned in Revelation. So either the Watchtower is wrong about all Christians being anointed, or they are wrong about only 144.000 being anointed.