So this lore isn't all over the place. You're not accounting for time.

The Queen Gunnhildr that became a primal using the sword did so during the time of the Allagan invasions. Remember the Allagans were hell bent on world domination and the only way others knew how to fight an army of echo users with magitech was summoning primals. Bojza did it too, just like Mercydia.

Obviously Bojza didn't fall during the war with Allag, instead they fell to Garlemald. Which, historically, happens much more recently. Radovan failed to protect the (recent) current queen from Garlemald. And failing the queen lost him his family (which were either killed or enslaved) and then he suffered in a internment camp for an untold amount of time.

Two separate time periods. This was explained in the story.