Schuckardt didn't even seek out consecration. He was offered it.
Church law (based on numerous papal decrees) says that you're SUSPENDED if you receive Holy Orders from a schismatic, not that you become a schismatic yourself
ipso facto. Given the state of emergency, I could see where such suspension would be lifted ... except that Daniel Brown abjured before performing the consecration, so even that may not apply. Biggest problem was that the validity of Brown's orders was suspect.