Maybe Rose was hiding that stuff since war then stuffed Lion with it. Though it would be neat if Lion was old af.
Big fan of the Lion question. If Lion is an old rose creation wouldn't c-gems have witnessed something similar like how they knew her vines & fountain? Then again she kept secrets like the armory...and it goes on and on.
I think on purpose by the crewniverse! Like how they had Greg lay on Lion in second intro, 22 seconds you could decontruct for days on how it portrays just one season of character growth