Tele 4 way wiring question...

I noticed in a few wiring diagrams that the tone capacitor is soldered back to to the tone pot itself, and others show it soldered to the far leg of the volume pot... why?

It doesn't matter. Both of those spots are ground. You should note that, when soldering the cap leg to the rightmost leg of the volume pot, you actually slip that cap leg though the eyelet of that lug, and continue it all the way to the tone pot casing. You then solder that cap leg at both points -- the volume pot lug and the volume pot casing.

Notice, also, that if you solder that cap leg to the tone pot casing, you have to bend the right lug of the volume pot so that it touches the volume pot casing. You solder that joint.

Either method is the same, but that rightmost lug of the volume pot must be grounded.