The games are on the same engine and requiem have few skins coming out because the BO6 ones were intended to carryforward into BO7. Do zombies players in general care about the goofier crew skins, like the Maya cosplays or the dead ops chicken? I think they'd fit the Dark Aether maps in BO7 better than some of BO6's. And what about the dope skins from events and battle passes? Brutus and Klaus also fit BO7 Zombies.
Can anyone really disagree that raygun blueprints should carryforward? And c'mon, that monkey bomb from the dead ops bundle is so sick. It's just a shame to withhold it.
I understand not wanting to bloat the mystery box, but why not put a few of the classic weapons from BO6 in map-exclusive boxes and on walls. Guns exclusive to maps in general is sorely missed in modern Zombies, this is the perfect way to do it without having to even code in new guns. You have them in BO6.