Lack of communication being a problem - sure. But you're conflating a few things.

1. In modern terms, bisexuality and pansexuality are interchangeable, the terms have evolved over the years and most of the community rejects the old distinction.
2. "The bisexual duality cannot be satisfied by the binarity of one partner" is the stupidest thing ive ever heard. They are bi, meaning their attraction applies to both (or more) genders. They aren't in heat with an unquenchable lust for sex with multiple genders. Someone can have a preference for brunettes and redheads and marry a redhead and not be "unsatisfied". The problem with closeted gay people marrying into a straight relationship is that they are denying their own sexuality, and lying to themselves. Bisexual people are not lying to themselves. They are attracted to their spouse. There is no confusion.