Is he trying to get to the food while Shadow is still eating or is he just checking it out afterwards?

We feed Jan in a separate room because she can be so mean and grumpy to her son Joxer. Joxer eats in the same room with Sid - they don't have issues.

But when everyone is finished, she makes the rounds to see what is left over. We call her the gleaner and we don't worry about it because the other cats are already gone so its not like she is kicking them out of their places.