Why did they continue to set up a plate for Sora? To make Link feel worse?

Probably.

It had been a lazy, uneventful day for Link. He was returning out tonight with Soma, the Once-ler, and Lingormr, which would be good. Hopefully they got farther than they had last night. That beast in the kitchen had been a nightmare, especially without proper equipment. He really needed to set out to find raw materials for that Alphonse boy to work with, but he had missed the chance with the trip to the courtyard.

Link sat down at his desk with his dinner, eating quickly and getting himself well fueled for the coming night.