I had a great-uncle who died on the day after Harding. His widow died in 1990 (three days before her 102nd birthday).
Coolidge and Hoover were two entirely different men. Coolidge often saw that federal government involvement in anything...even rescue or support after a major flood...was not necessary. Hoover was the opposite....believing that the federal government needed to be there to support the role as ‘protector’.
The word “wonder-boy” was one of those affectionate terms that Coolidge gave Hoover....mostly because of his planning and engineering talents. As much as Coolidge was blessed with common sense....Hoover was blessed with great planning talents.
The true difference between the two comes up as Hoover sees the necessity of the government trying to fix the Wall Street failures in 1929. I would imagine that Coolidge would have done almost nothing. It’s hard to say who would have been right.