The red camellias are symbols of love and dying with grace in Japanese culture. It can show how 6 bravely faced dying. They’re a flower of honor and respect to samurai, but are also bad luck, because when the flowers fall, they don’t scatter in petals; the head flower comes completely off.

He’s relieved that his soul is okay.

A kodama is a tree spirit. When a tree turns 100 years old, a spirit will come and live in it. Five spirits were already coming down, and the bacteria is human souls. The lost 5 can live on as nature spirits, walking where the grass, flowers, and trees thrive. If the Great Forest Spirit and his little kodama can preserve the forest, then so can five ragdolls.
Screw you, they can and will live on as nature spirits.