For those interested, someone run the observations and math, and calculated the overall damage reduction as well as movement speed and damage output a possessed enemy gets.
Epic Bethesda, fucking up in a meta way which screws over their future success. I bet the developers at id Software are pissed at the publisher division.
Eh, I can accept Doomslayer/guy being better than others because he has experience, equipment, strength, and (presumptly) accumulated wisdom thanks to his age and the spoiler incident.