DT - Everything hinges on whether or not certain Bible Students in Brooklyn New York were examined and then appointed in 1919 to be the Faithful Slave...and that their mandate was passed on to all subsequent Watchtower leaders.
If they were you should stick with their teachings. If not, you are free to study the Bible for yourself asking God to guide your understanding.
My advice, based on their history, is to assume they are not and let the word of God determine what you believe.