If j.smith had stayed with the teachings of the restoration movement there would be no lds now.
“Where the Scriptures speak, we speak; where the Scriptures are silent, we are silent.” was and is a basic view of the restoration movement
I agree, Smith built upon the views of Campbell, Smith’s theology was evolving in the early years and that can be seen clearly as can Campbell’s influence. There are some good studies on the relationship between the two.
Dan Vogel, D. Michael Quinn and the recent Rigdon Bio also have quite a bit of info on the two groups and their connections.