In short, Daniel Thompson's painful instructor career began amidst chaos.
He did not understand the Sage Project, because he was just a pawn and an ordinary one at that.
He had no access to information.
In many past timelines, Daniel Thompson was just a mediocre instructor most of the time.
He may have had high ideals and many principles, but his ability was limited to being a qualified military trainer and nothing more.
Daniel Thompson died early in most timelines.
He did achieve some success, even earning the title of "Humanity's No.1 Instructor", but his achievements primarily came from Harrison Clark's recognition.
Unlike other core figures such as Nora Camp, Needham Brown, Martha Owen, Bernal Connor, etc., in the Sage Project, Daniel Thompson also played a core role but lacked their extraordinary talent. He represented the vast majority of humanity's future — ordinary people.