Understanding Dr. Cowley's concept of the golden hour can better be accomplished if we look at the situation as historical researchers, rather scientific researchers, trying to understand the meaning of an ancient text. Look at the context of the times he wrote it in. He was THE pioneer in the modern field of trauma care establishing preceps w/o the benifit of the knowledge or medical technology we currently have the luxury of.
Prior to Dr. Cowley's revolutionary changes, the basic tenents of trauma care were to take your time and allow the pt to stabilize before initiating treatment. A pt could sit in the hospital for hours before any real attempt to treat him was begun.
At that time doctors did not have the bank of X-rays, CT, MRIs, etc. Significant exploritory surgery was required to find and fix the insult. Rather than letting a person sit for hours, he promoted rapidly initiating assesment and treatment of trauma pts. His concept of initiating it in 60 min or less was most likely based around the limited knowledge of trauma care and limited resources available.
While the whole 60 min thing might not be as important as it use to be, just like dealing with a MI or CVA, time matters. The only true "cure" for sigificant truama is surgical intervention and the faster the time from the traumatic injury to appropriate intervention the better the chance of full recovery.