I purchase one of the Legacy ESE 'Mercury" hudsons back when they were offered. There was some concern over the accuracy of the spoked rear driver, it bugged me too.
I was perusing the internet and ran across this photo posted on an older Niagara ESE thread by member PC5980. The photo proof as well as the caption prove the rear driver is indeed a "spoked" driver.
I will now sleep much better tonite.