"Guy" and "man" have different connotations with adjectival nouns. Like "tree guy" = arborist but "tree man" = he lives in a tree, or maybe he is a tree.
"I know a guy" = "I have a useful contact."
"I know a man" = "I am about to tell you a story."
“He’s a great guy” = he is pleasant and fun and well-intentioned
“He’s a great man” = he has saved countless lives and changed the world irrevocably
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