The Consent of Joseph?

"If I can pass brother Joseph, I shall stand a good chance for passing Peter, Jesus, the Prophets, Moses, Abraham, and all back to Father Adam, and be pretty sure of receiving his approbation...If we can pass the sentinel Joseph the Prophet, we shall go into the celestial kingdom, and not a man can injure us. If he says, "God bless you, come along here, if we will live so that Joseph will justify us, and say, "Here am I, brethren, we shall pass every sentinel." (Journal of Discourses, Brigham Young, Vol. 4, p. 271-272)
"No man or woman in this dispensation will ever enter into the celestial kingdom of God without the consent of Joseph Smith. From the day that the Priesthood was taken from the earth to the winding-up scene of all things, every man and woman must have the certificate of Joseph Smith, junior, as a passport to their entrance into the mansion where God and Christ are - I with you and you with me. I cannot go there without his consent. He holds the keys of that kingdom for the last dispensation - the keys to rule in the spirit world." (Journal of Discourses, Brigham Young, Vol. 7, p.289)
"He stands, therefore, at the head of this dispensation and will throughout all eternity, and no man can take that power away from him. If any man holds these keys, he holds them subordinate to Joseph Smith...If we get our salvation, we shall have to pass by him, if we enter into our glory, it will be through the authority that he has received. We cannot get around him." (Journal of Discourses. Apostle George Q. Cannon, Vol. 24, pp.275-277)
Just a few quotes to show that Mormons DO believe that nobody can get through to heaven without going through Joseph Smith first!
I give all the credit to Reachout Trust Research Ministries for the information. Please click on their icon at the bottom of the side bar and look under the article, "Mormons and Judgement" and read the whole article. It gives a complete look as to why the Mormons think Joseph Smith has such a role.