My thoughts..
They put the cart before the horse.
Ideally,putting the horse before the cart would mean that Jesus would have explained how things were to function in the last days.
But he didn't. Instead a printing company was started. It had followers. It grew into a religion with the printing company's board of directors being the leaders of it. They found that scripture of the Wise and faithful servant, retranslated it to Faithful and Discreet Slave and used it as a basis for authority to run the religion.
Also, the Catholics base their religion around one scripture. Matt 16 and upon this Rock I build my church applying it to Peter. Peter's successors are the popes.
the GB build their religion upon Matt 24:45-47 and the FDS.
The Catholics emotionally and unreasonably accept what the pope says. The JWs do the same with the FDS teachings.