First off, I am aware I will be roasted by Xaku mains for this, but I was looking at the upcoming primes, and Xaku is soon-ish.
A friend of mine suggested that they shouldn't be primed, because of what they are, a combination of 3 other frames that were lost.
Which made me remember, we NEVER got the Lost Frames that make up Xaku. Which I think was a HUGE missed opportunity.
So what I'm suggesting, is why not get them in prime form only? They are lost frames, so its not unreasonable to not be able to have the non prime versions of them that the tenno make today. We already have a couple weapons that only have prime versions, why not these 3 be only prime too?
The idea of the lost frames is already baked into Xaku's lore, parts of their bodies are already designed on Xaku's model, and one of each of their moves is already set up in Xaku's kit.
Doing these 3 as the next primes when Xaku's time comes up would be a very unique
Here's a link to a reddit post I first saw them visualized on, and an image of the frames in question. I am aware its a fan edit, but still.
https://www.reddit.com/r/Warframe/comments/g4h37i/broken_warframe_origins_fan_edit/