I hate to say but what I see there is an animal acting like an animal and testing out a possible food source.
Bit of a struggle going on between "Yum yum" and old scents & recognitions . . . .
To a feline or canine...protein is protein. Not nice...but they are just hardwired to survive and make the most of what is in front.
Totally and absolutely DISAGREE !!
It is impossible NOT to notice that the surviving cat, tries to lift its friend by the back-of-the-neck . . . just as a parent moggy would lift/carry/move, a kitten.
I have no idea, to where it thinks it is going to move the corpse, but it is clearly not happy with it remaining where it is.
The licking of corpse's coat . . . I would suggest . . . is a desperate, fruitless, act of grooming . . . rather than a stimulus of the gastric juices !! .
Ah! After many years persevering with his/her/its contributions . . . I discovered the IGNORE function - which will continue to be applied - and, would be why this particular post did not appear !!