It would seem, although appearances can deceive, that physical corruption is pre human.... So would we say physical corruption is a Benefit for animal, insect,plant life as well?
Physical corruption is not pre-human because only humans are physical (with spiritual capacity). Spiritual corruption is pre-human because of the fallen angels who are spirits. It's not of benefit to the animal life, etc., to experience physical corruption; it's actually of benefit to us to see how the rest of creation suffers, so that we repent. God allows the rest of creation to co-suffer with us for our benefit (the servant suffers together with the master).