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The amount of blood would, by itself, only show someone died there.
It would not show who killed them.
And you would need DNA confirmation to identify the victim.
They do not want to arrest someone too early as the charges could end up thrown out, or evidence blocked.
And you certainly can't just arrest them all and sort it out later.
I don't think they could be 100% certain someone died based only on the amount of blood, only fairly certain that a person would most likely not survive an injury that caused that amount of blood. I would assume they need additional evidence.