The Lord expects us to be able to put two and two together. If you know the temple is connected to the Holy Ghost than you know the church is true. What need is there of a specific revelation of what we already know? If you know you enjoy the Holy Ghost as you study the book of Mormon, then you know the book is of god and you know that the church is true. What need is there of further revelation on that matter?
Far better to move forward from what you know to greater light than to stay back fretting over whether or not you know what God has already plainly laid out before you.