However, for all practical purposes, having a player in respectable game shape (and this happens even if their minutes are well-managed) is like having a HT player in weak form.
This is an interesting point.
My immediate reaction is to agree but I wouldnt know how to prove it right.... how did you arrive at this conclusion...
Iit's not like this is some empirical conclusion. As a matter of fact, my point is likely well exaggerated.
However, in my experience, there is a significant difference in performance between respectable and proficient GS, which can be quite bad if it happens to your star players, given how the GE here relies on individual player characteristics. So the luck factor is right there, even if it is to a smaller extent.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."