imo both fights are not needed anymore. get your free ezmode i200 weapon which beats the rav weapon. bis ex was useless day one because of yoschi screwing up his rewards from the get go. to late to fix that now. if bis weapons had been i185 and rav i190 or i195 people would have done bismarck more maybe. but they are useless the second you reach 60 and get your free i180 weapon which doesnt require skill or much work. and now you can get i200 weapon. the primals dont drop anything outside of thier weapons.
why bother at this point?

they will both be added to df when 3.1 hits and not any sooner.