So?
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For all of WWI airfoils(RAF6,ClarkY,Gottingen), 4-blade design is useless, but for the newly developed NACA16, story is different.
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Did you read the NACA's own findings on the Clark Y and NACA 16 series?
The 16 series has poor lift production and its only real application was in propellers. It was generally considered to be worse than the Clark Y even in that application. The NACA 16 series was supposed be low drag at high speed and designed for the very high transonic realm. It was a real disappointment to the NACA.
Go back a few pages and re-read it. It will confirm there was no difference at speed and the Clark Y was actually better overall.