God DAYUM this was one helluva chapter and I have lots of things I want to say
First things first, DAYUM that reveal was surprising. I had the same reaction as D too and Yellow Ranger shit eating grin is something. Yumeko clones honestly gave me a small Evangelion PTSD.
My theory: all the original Dragon Keepers were actually all women! Now hear me out, all of their silhouettes seem to have all long hair and the Blue Ranger divine tool was made from a female despite seemingly all Blue Rangers being male. If Yellow Ranger created the Invaders and he seems so young then he must've done something to make himself stop aging.
My second theory: our Yumeko is actually a clone and she has a shorter lifespan or doesn't physically age appearance-wise but still has a lifespan, which is why Yellow Ranger said she's on the clock because she doesn't have much time left to live. Usukubo is also a clone! Well, technically not, but she was made by mixing an executive's DNA (if they have any) with her dad, and boom she was created!