No, you don't.
Then name another. Does the Bible record any other instances of Elisha's bones? I don't think so!
Jesus used many methods for healing people. Sometimes he just spoke, at other times he did things as unusual as making mud with his spit and applying it to the eyes of a blind man. In the Old Testament we have the example of the man being healed by dipping himself in the Jordan River and of the walls of Jericho tumbling down after the Israelites marching around them. One wouldn't develop an entire doctrine on wall destruction by marching, eye surgery by spit mud, or leprosy healing by bathing!
As I noted, I heard you. You're not hearing me.