You have managed to side-step the point that I am making in favour of attempting to discredit the source of information.
Yes I am a chiropractor, meaning I spent 4 years getting a doctorate degree that includes significantly more musculoskeletal training than what a medical doctor receives. This was after I spent 4 years receiving an Ivy League education in neurobiology. Not a medical doctor, no. But I do consider myself informed on musculoskeletal issues. I do run a baseball development company that trains baseball players. We currently do not offer any service that runs year round. The other 'non-doctor' on my page is not me, so I am unsure what he has to do with the points that I made. I don't need to cite that the article I posted was my own --- obviously it's an extension of my own thoughts in the previous post.
Let's return to the point that I am making.
Your body adapts to load or stress. The volume and intensity of which will dictate your biological response. The idea that throwing year round is inherently dangerous is physiologically false. The research and guidelines that you are presenting were founded upon the idea that HIGH LOAD (high volume, high intensity, high frequency) were associated with increased overuse injury. Now of course, very high demand - too many throws, really high effort throws and no rest - relative to what the athlete can handle (capacity) will ultimately result in injury.
Demand >>> Capacity = injury
Subsequently, if you lower the amount of demand (lower volume of throwing, more rest, or intensity) relative to capacity, you are far less likely to succumb to injury. Isn't that exactly what the MLB guidelines suggest? The top sports scientists in the world, not orthopedic surgeons but the people who actually study injury prevalence data, came out with a very important consensus statement on the topic in May. Asking too much relative to what a person can handle significantly increases the likelihood of injury. Moreover, moderate amount of consistent loading is protective of injury.
My point is quite simple. You can absolutely throw year round with low intensity, lots of rest, or lower volume. The demand is low relative to capacity. Moreover, the cessation of application of load or stress to a tissue or your CNS will lower the capacity of said systems. Your body adapts to load and stress.
If you want an example in another sport consider a marathon runner. Over the course of the off-season they (hopefully) gradually build up a very high capacity to handle lower extremity loading through training. Their tissues and nervous system get stronger and more capable of handling 26 miles. In season, the demand they are placing on their body may become more frequent OR higher in intensity relative to what their training entailed. Their tissues or CNS may begin the process of breakdown. One particular runner ends the season and isn't hurt, but a considerable % of their peers succumbed to overuse injuries. This runner decides that they need time off at the end of the season from running with such high intensity and load. Would your advice then be that they shouldn't light jog at all for 3-4 months? What about walking? Both of these activities load their lower extremity.
I am sorry for the length of this post. I am hopeful that you're response addresses the points that I have brought up rather than discredit my assertions with ad hominem attacks.