"it’s good to see the idea that humans’ alimentary instinct still works with raw unprocessed foods had been suggested before GCB thought about it." 
You must be kidding. The idea that our instinct has been designed specifically  for raw food (and only for raw food)  has been around for centuries, and is certainly one of the  hotest  topics in the history of both  scientific and naturopathic hygienism. 
If you read "Lectures on the science of human life" by Sylvester Graham (1839) , you will find that the whole book deals with the matter  of  human food instinct although from a purely vegetarian/biblical/puritan/naturopathic point of view .  Now if you turn away from naturopathic litterature to scientific litterature produced by (then) contemporary military physicians  (during the so-called "Romantic" period) you will find  equivalent  treatises on food instinct  written from a non vegetarian /non puritan/spiritual  perspective. Obviously their goals and their audience  were not the same :  while Graham was trying to catch the largest possible audience to evangelize masses of american drunkards, military physicians were trying to elaborate a  theory of human food instinct  putting together elements from various disciplines, to call the attention of fellow scientists.   Graham was making a business while military physicians were working behind the curtains. 
Military physicians of the XIXth c. remained unimpressed by the then rising tide of vegetarian sects and their failed attempt (by Graham and the likes) to "take over" the idea of food instinct. It is an historical fact that vegetarianism , as an hygienist theory , litteraly came "out of the blue"  at  the beginning of the  XIXth century,  without any  historical precedent  in the western world (apart from  the so- called phytagorean sect ).  Military physicians who  adhered to the  age- old (warfare like )  tradition of  instinctive hygienism,  had no reason to abandon their  omnivorous stronghold  for a more fashionable  vegetarian theory of human food instinct.
Both currents of  thought (the "naturo-vegetarian" and the "militaro-omnivorous") remained opposed. But this did not prevent them from sharing all sorts of heretical findings/hypothesis on other medical subjects.    
"I doubt very much  this T.L. Cleave also developed the same completely new theories about bacteria / viruses, immune system response (tolerance – intolerance), autoimmune diseases, etc. as GCB did."
You must be kidding. Burger has no more invented those theories  than he has invented the durian or the idea of food instinct. In every field of science , you will find heretic minds who constantly  produce heretic theories which can be made compatible with an heretic food hygiene theory . You may even find scientific medical  journals publishing research papers  which are considered too hypothetical or too  heretical to be published in mainstream scientific journals. The choice is yours : if you need an alternative, all-encompassing, theory in the field of virology, immunology, allergology, I can fetch a dozen  for you. 
Cultural differences also account for the variety of alternative theories. In allergology , the UK approach to natural "immunization"  against environmental antigens has gone as far as recommending to  shake the dust bag of your vacuum cleaner above the nose of your baby  so that his immune system may be in touch with natural antigens at the earliest stage of his life. From a french physician  point of view , this recommendation may border  on  insanity .  
Have you done any research  in history of immunology to determine whether Burger is a true genius or a mere plagiarist ?