1. The King James Translators did not doubt the Textus Receptus and the Hebrew Masoretic text. They said there is no perfect translation to the extent we can consider that translation inspired. On the other hand we must consider this translation to be the Word of God.

2. John Smith believes that the original Hebrew and Greek are given by divine inspiration and in their first donation were without error most perfect and therefore canonical. Are we ready to believe that God can keep our salvation, but he is so weak that he could not keep his word as he promised.  Mark 13:31

3. John Owen He is speaking of translations and not another text beside the Textus Receptus and the Masoretic Hebrew text. He did not say let us translate the Vaticanus Greek text. The vaticanus Greek text is the text send by Eusebius  to the emperor Constantine. (Read appendix A)