Here is a another new piece of research (2019) that provides more scientific support for what I have been saying for many years.
T3 is critical to the workings of the pituitary gland. Without adequate T3 the pituitary is susceptible to dysfunction, and the anterior pituitary hormones may be affected. These hormones include ACTH, which drives both cortisol and Dhea production in the adrenal glands.
This is another piece of data that supports the protocol I developed in the Recovering with T3 book, i.e. CT3M: