Who is the greatest Witness of Jehovah?
Based on Matthew 26:31-45, I'd suggest Mother Theresa of Calcutta. "In truth I tell you, in so far as you did this to one of the least of these brothers of mine, you did it to me... In truth I tell you, in so far as you neglected to do this to one of the least of these, you neglected to do it to me."
Let me know when the Watchtower goes to an impoverished country and opens a food dispensary, or a hospital, or an orphanage, or a school, or digs a town well, "for the least of these." Taking care of your own is not enough, we are called to care for strangers, even enemies--as told in the parable of the good Smaritan (Luke 10:29-37). "Which of these three, do you think, proved himself a neighbor to the man who fell into the bandits' hands?" "The one who showed pity on him." "Go, and do the same yourself."