Good informative post.
IMO HCG is old school thought.
As you said it has no real use as post cycle therapy since it doesnt recover the HPTA suppression but actually makes it worse.
Whereas I agree with all the physiology from what I gather from your post the reason to take is it to reverse testicular atrophy and make the testes enlarge near the end opf the cycle.
I find that somewhat difficult to envisage.
Now if we analyse the structure of the testes
A testicle contains about 250 testicular lobules; insides each of these are 1 to 3 tightly coiled seminiferous tubules. If outstretched, each seminiferous tube would be 2 to 3 feet in length. The seminferous tubules are the site of sperm production
The seminiferous tubules are also lined with pyramid-shaped cells known as the Sertoli cells. Located in spaces between the seminiferous tubules are the interstitial cells, which are also known as the Leydig cells. Their function is to produce testosterone,
So the testes is mainly comprised of tubules and sertoli cells.
Leydig cells are less in number,the very name interstitial cells tells you they are scattered in between the tubules.
As HCG has the actions of LH it acts on the Leydig cells.
So to increase the size of atrophied testes HCG would not be the drug of choice and along with its HPTA suppressive effects thats why IMO it is redundant.
Peace.