Still doesn’t dismiss it. According to Jim, the bloodline remains across many generations and is _always_ passed down to the kids (I know Jim’s not exactly an infallible expert but given the Jocasta side of Michelle’s family was presumably hidden for generations before the medallion got back to her it shouldn’t be dismissed)– even if Mom’s a ‘pureblood’ reverse gryphon that doesn’t mean Dad’s side of the family was purely human.

Maybe Sam just needs to go to Madame U’s and touch _every single medallion_ until they find one that works!