I came upon that source as well; it was the inspiration for much my first post in this thread. However, it failed to provide an alternative meaning for 'well regulated militia'; whereas the enumerated Powers of Congress seemingly includes Congressional authority regarding a militia outside the scope of a militia employed by the government itself. If that's not the case, why discern as much? Why say 'well regulated' at all? It would seem they might also include some expansion or description of what types of regulation are warranted. I believe this where that is done:
To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers,
and the Authority of training the Militia according to the discipline prescribed by Congress;