Before I watch this later when I have more free time, a small aside about G. C Marshall may be in order.
Marshall is somewhat (given where the spotlight tends to go in a war) an underrated general and character in many ways.
This is mostly due to fact he was not in theater direct command role like say Ike, Patton, Bradley et al. who get much more of the spotlight...given human mind is drawn to the "action" aspect.
He was much more strategic logistics driven, army staff management and (very important) liason with the political leaders in comparison. Not surprising as he was Army Chief of Staff....but he was especially competent at it if you study what he did (as I am sure this video also gets into). This played no small part in the naming of the later "Marshall plan".
Ike (whom I hold as gold standard) was promoted and sent to Europe (as chief of theatre) on his personal recommendation actually....and that says quite a lot (he could gauge exactly why Ike was the man for the job).
There are good points brought up in Ike's biography (by Michael Korda) regarding this that I remember to this day.
I rate Marshall slightly above RAF High command in the WW2 era (and that is a high bar indeed)...and just a slight touch below Ike who I have at the overall top (given importance of strategy to success, not just brilliant tactical stuff like more famous names of the War are known far).
Any military's most competent senior minds would do well to study Marshall deeply...if they have not already.
@VCheng