>>149177966
Psylocke was in X-Treme and then she was dead for a while because Quesada had an autistic fit about deaths not mattering even though she was never intended to be Dead dead. Claremont also wanted to bring her back in her British body but higher ups said no because Japanese Betsy was the most popular version of the character. It had to take the Wokening to make that happen.
>>149178043
Morrison directly acknowledged Casey's X-Corps in his X-Corporation arc. He also respected Claremont's disagreement with his approach when he had Sage and Bishop show up in the book.