multisexual identities often overlap. they got two definitions correct, those being pan is all and poly is most but not all. bi is where it all can overlap. because traditionally it was seen as attraction to men and women because at the time those were seen as the only two genders in most western society. but bisexual was originally a degrading term, as were many (such as homosexual). bi people reclaimed and redefined it as what they identified as, that being two or more genders. meaning that some people who identify as bi could be attracted to many but not all genders and still identify as bi so, therefore, they would be bi. someone could even be attracted to all genders and still be bi because it is attraction to two or more genders and it is, ultimately, up to the person identifying. but if you ask 90% of bi people, they will tell you that the definition is attraction two or more genders.