Isn't the blue-grey tone the result of the incorrect balance level of the blue colour of the pic?
Anyway .. a similar camo can be found on the early Ki-84 ( according to the pic caption ). The camo consisted of two green paints - the dark green and lighter green-brownish one. The profile for the kite can be found in the Kagero monography for the plane.
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the source: the net and Kagero book.
The same can be found in the Sword 72032 kit
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However the Hasegawa 08154 suggests the one green tone overall tops.
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