Nice query Sir Galileo.
I don't believe there is any debate about whether GH enhances collagenous strength it does.
This is well substantiated in patients with GIANTISM because of EXCESSIVE endogenous GH secretion and more recently with stem cell research.
Moreover the effect of GH on collagen are much more SELECTIVE than AAS, (which at present is believed to enhance skeletal muscle PS almost exclusively and as evidenced by the study posted above may in fact be deleterious especially in the post operative patient where ENHANCED perfusion is a CRITICAL component of wound healing. (Recall the study suggested AAS may decrease blood flow)
Furthermore the effects of GH on protein synthesis appear to be relatively uniform.
That is it improves protein synthesis, mitosis and subsequent reproduction in ALMOST ALL CELL LINES, including the VASCULAR system!
(FYI, It's postulated this "reproductive effect" may be responsible for the ASSOCIATION between elevated IGF levels and certain forms of cancer)
Finally GH accelerates protein synthesis by TWO mechanisms HYPERPLASIA which results in an increase in the NUMBER of cells, and HYPERTROPHY which causes the SIZE of a give cell to increase. In contradistinction the effects of AAS are the exclusive result of HYPERTROPHY.
Now why does that matter?
The possibility of maintaining "gains" are likely greatly enhanced when it is the result of HYPERPLASIA especially compared to HYPERTROPHY!
Jim