I agree with you about Jack. But as for Clarissa, why should she get more lines just because she is disabled? From what we have seen so far she is played by a perfectly decent actress who is entitled to be cast on merit, not as a token disabled person.
I didn't really think she was that good an good actress.
She seems to be written as an annoying tv trope, the disabled snarker. I hope they do develop her beyond that though.