Pistol - I was taught here at this website that PA#4 is completely released when the left arm-chest wall angle is 90 degrees. Hogan achieves that 90 degree release angle by impact, so I presume that he has completely released PA#4 by impact.
It is my personal opinion that Hogan is a swinger - based on watching his swing video many times. If I am correct, then PA#3 release is essentially a passive phenomenon and not due to the active release of PA#1 that thrusts the straightening right arm through impact. If you have reason to believe otherwise, please provide the "evidence" (and the statement "I wish I had three right hands cannot be considered "evidence").
I do not believe that Hogan always used angled hinging, He sometimes employed horizontal hinging. However, I think that he preferred angled hinging because he preferred a power fade shot, rather than a low penetrating draw. I think that he was skilled enough to use either angled or horizontal hinging at will.