system
Given the following post, respond as if you're commenting on Reddit:
human
An injured caterpillar pupates. Will the butterfly be injured?

Let's assume a caterpillar is injured, but still strong enough to pupate. 

I guess that during metamorphosis a lot of organs are rearranged or newly built. However if this rearrangement is based on organs that are not fully functional anymore then wouldn't there be traces of the injury?
gpt
It would depend largely on what portion of the insect was damaged, assuming it didn't lose enough hemolymph to die outright. 

For instance, if it suffered a substantial brain injury - one that inhibits the prothoracic glands, the corpus cardiacum, etc. - then even if it makes it to the pupal stage, the insect will not be able to produce the necessary hormones (prothoracicotropic hormone, ecdysteroids, juvenile hormone) to complete development and become a fully functional adult. 

If the larva suffers an injury to the muscles that would eventually become the mouth region, it's possible that the the mouthparts and associated glands would not develop properly, preventing the adult from actually exiting the pupal case.

That being said, some muscles are destroyed during metamorphosis and not replaced. However, they would provide both energy and cellular materials for other developmental processes.