I do not understand what is not known of Mr Cestari and his training,ranking and teaching,as the link supplied shows some of his rankings and Instructors .
Is this discussion just to be about his Combatives teachings,WWII combatives or his complete range of learning,training and teaching ?
Carls teachings of Combatives as seen in WWII applications by FAS,the US Marines ,the British Commandos are straight up simplistic,easy to learn and employ battlefield,Eliminate the enemy,Killing techniques.
As I have said,I was exposed to USMC Combat Judo/WWII combatives at an early age by my Uncles,one a China Marine/Judo Instructor and the Other a USMC Close Combat/Combat Judo Instructor.
I had also been able to see Mr Nelsons Materials as a spectator to my Father and his Partners
experiences with Mr Nelson.
I have experiences in Combat Judo as taught through the USMC and through friendship with instructors in the USMC.
I also have experience through the teachings of WWII styled applications as taught at SFQC ,US Army Special Forces Qualifications Course
I have had experiences through down line people associated with Carl such as Kelly McCann who is a down line of Bob Kasper,W R Mann who is a Down line product of Kelly McCann,Mr Perkins who had some experiences with Carl,Steiner and others.
What Carl taught in his video series is straight up Combat Judo/WWII applications of the basics of Combat survival.
What I saw Mr Nelson teach were the applications beyond the basics,more of the judo,jujitsu and boxing /striking applications of self defense.
(one had to make adaptations to the basic battlefield application as all street self defense cannot end by closing with and Killing the opponent)
What others teach in the way of Combatives is their versions of the application which is not hard to understand and master and has very little room for error as the attack and destroy principle is not hard to grasp.
I wish I had been able to train directly with Carl,Mr Grasso,Clint or Bob Kasper,though I had opportunity to meet and talk to Mr Kasper and would have liked to have trained at the NJ Gung Ho Chuan Association.
(I have written to Mr Grasso about training,no response,I hope he and or Clint come out with more of Carls teachings or their materials as applied to street self defense)
I hope this does not become a bashing of a man who is dead,unable to come on and defend himself,we can appreciate that he shared his knowledge and if it fits your needs,fits your likes then do it,if not find other materials that fit the end,or better yet search,train and MIX everyones material that works for you.
Mr Grasso and Clint appear to be students of ALL the arts as was Carl and I am sure they have seen this site and Hocks and others materials or applications.
( I do not see what drawing him to this site is to accomplish)
The above is My two cents ,which is an opinion of mine and my quest for learning,training,applications and implementations.