Mormon Doctrine, pg. 591; “…the supreme officer of the Church, the “President of the High Priesthood of the Church…His duty is “to preside over the whole church, and to be like unto Moses…He is the one man on earth at a time who can both hold and exercise the keys of the kingdom in their fulness. (D. & C. 132:7.) By the authority vested in him, all ordinances of the gospel are performed, all teaching of the truths of salvation is authorized, and through the keys which he holds, salvation itself is made available to men of his day.”
John 6:37; “All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out.”
As you can see for yourself, Jesus said nothing about supreme officers, being like Moses or allowing salvation to be available again through someone other than Himself.