Um, yeah exactly. All of those other sides wore a variety of colours, none of which were apparently "newcastle's colours" (if that even exists).
Whereas the two most prominent sporting clubs in the town, the Knights and three out of the five nsl/a-league football clubs, have had red and blue uniforms (consistency).
Didn't we just establish that the Knights wore red and blue because it linked to Newy boys high?
Seems pretty straightforward to me.