In recent chats here, there is a member who claims such a title. My thoughts are prudence, and we should take things with a grain of salt. ( as my mom used to say).
Other thoughts that come to my mind, ( after hearing of him) well why not. After all, it isn't like the "Two Witnesses will pop up" out of the ground, in Jerusalem. They will have to come from somewhere.
As the Scripture states, "I shall send" Rev 11:3.
And knowing how it was for John the Baptist, he was born and killed. And yet Jesus refered to him as Elijah.
Even greater proof is shown in Matthew, as John the Baptist was killed before the transfiguration Matthew 17:3 scripture states the apostles recognized Moses and Elijah. They knew John the Baptist, but he was not present.
What this shows us, the spirit that was in the heart of John was the same as in Elijah, but these two individuals are different people.
So the Witnesses, although having the same spirit and zeel in thier hearts, will be two other individuals as well.
On a side note, there is no evidence to conclude the Witnesses are Jewish, nor that the message is only for the Jews and Muslims. As scripture also states Rev 11:10 "and the people of the world will be glad about it and celebrate the event by giving presents to each other, because these two prophets have been a plague to the people of the world"