I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
Sooooo... Black Bolt has five queens.
Five wives, dude. Four are aliens. With, I'm assuming, alien customs. Because juggling five human wives from the same culture would just not be hard enough. Five human queens from different cultures? Still not the challenge Black Bolt is looking for!
No, no, he needs something much more complicated than all that jazz. Wait, there are four alien queens of the Kree metagenesis program? Awesome! He'll marry them, and then tell Medusa it's to reunite all the Inhuman families!