Brainlock says it quite clearly.
There are prerequisites for medical school that PA's are lacking i.e. biology II, chemistry II, organic chem I + II, physics I + II, MCATs.
I don't get it, in another post about MD to PA there were lots of arguments including the importance of the 'journey' and attitude and not the tests. Here in the PA to MD you have the opposite arguments and want to skip over some classes when you don't even meet the minimum course requirements for entrance.
"I then say that the information that is new, ie the basic sciences, really isn't as clinically relevent... There is definitely new information that will be presented but imo a practicing PA going to medical school so that they can learn about the metabolism of a specific protein or to memorize a detailed cascade in immunology isn't going to prepare them any better for treating patients than where they were when they started the process."
This is wrong- it is relevant to the in depth knowledge of pathophysiology of the human being. It is this depth of knowledge that makes the difference.
I'll give you an analogy which you seem to like, a 20yo female comes to see you with an abscess with surrounding cellulitis and is allergic to PCN, got a rash to a ? med she took in college for UTI, and got C.Diff. from clindamycin for a tooth abscess last year. What antibiotic do you use?
Another is the elderly hispanic female who comes to you after going to the movies with her translating daughter with severe eye pain and loss of some vision. She is a diabetic, asthmatic, and got a rash as a teen in Mexico when treated for a UTI. How do you treat her?