Minawa, Inner Fire [...] Supposedly like Wakahisa (drain and share chakra?)
So does anyone else see the connection between this bloodline and Noburi's? If bloodlines are artificial --that is to say, that they were made by the Sage, or the result of some sort of chakra-style genetic modification --then there's a clear connection in thought between these two bloodlines. They share the same initial idea, with the experiment being conducted on "fire" aligned chakra users instead "water?"
It could be that the creation of the Inner Fire was less successful than the Vampiric Dew --as seen by the fact that the Wakahisa have a greater chakra capacity than the Minawa, while still having a very similar bloodline (in terms of the "end result"). Perhaps I.F. was created first, but the results weren't quite what the creator(s) wanted, so they tried to create whatever they had in mind again, but with Water Chakra this time --the polar opposite of Fire Chakra.
The only question is whether or not the experiments that led to the creation of the Vampiric Dew was a success, or if it simply failed
less than the Inner fire.
Mori, Frozen Skein [...] Analyze plans, saps creativity, has a "greater purpose"
Raiyoke [...] "ingenious without curiousity"
Again, both of these bloodlines share a similar theme --logical analysis --with the Frozen Skein being the superior bloodline. Raiyoke allows for tackling the same ideas/plans/notions from different angles, but the Frozen Skein is vastly superior in terms of sheer analytics. I propose the idea that the creator(s) of bloodlines were looking to create a method of increasing critical analysis and deduction while doing their best to remove emotional blinders, for the purpose of strategic planning/advising.
The Raiyoke was an adequate result, but the curiosity needed to examine information and connect dots had been suppressed too far. Perhaps a new use could be found for this bloodline
(examining ready-made plans or preexisting ideas from different angles to find new insights) but the original purpose --which was the creation of ideas and plans, using logic without the haze of emotion --failed. So the creator(s) took what they'd learned from their first experiment
(and, perhaps, the many experiments prior to the Raiyoke that weren't successful enough to result in a bloodline at all) and created the Frozen Skein. And they were successful. Perfect advisors without ambition to lead.
At least, that's assuming that my idea of the bloodline's intended purpose is correct. It's entirely possible that I'm wrong and that the Frozen Skein was as much a failure as the Raiyoke.
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Crackpot idea time: Before the Warring Clans Era, there was a ruling caste of advanced humans/nonhumans that experimented on chakra to create bloodlines. Maybe this ruling caste created chakra itself, maybe chakra has
always existed in the MfD iteration of the Naruto-verse, or maybe the creation of chakra was independent of the ruling caste. This ruling caste created bloodlines so that their slaves would be more useful, and thereby more valuable. Something eventually happened
(I suspect the Sage led a civil war/revolt against the ruling caste with the help of the bloodline-slaves, and that it was this war) that caused the ruling caste to vanish.
In the aftermath of the war, the Sage died, the Ruling Caste died/vanished, and the slaves were left leaderless. The wielders of these bloodlines grouped together in clan/tribal fashion and began fighting the other groups for what resources still existed. Time and war warped history until the Shodaime led the clans into the modern era by hook
and by crook. Modern civilians are either the descendants of these groups that didn't inherit bloodlines, or were part of the lucky few that weren't experimented upon originally.