battery move and earthing kit?

First a little info on car 1990 mitsubishi eclipse,
all wiring is 0g
Big 3 done
Battery(Odyssey PC925) relocated to the back and the main battery ground wire is about 2 feet away,which is grounded to the frame with a bolt nut and washer paint scraped off to metal etc.

Question:
I have a second 0g wire that is running from the battery to front of car which goes into a distribution block that I'm using as my earthing kit source.this also has my ground wire for the starter.Do I need to have this wire running from back to front? or seeing how I have the battery grounded to the chassis,could I just take about 2-3 ft of the the 0g and bolt it to the chassis/frame somewhere under the engine bay and still get the same results?
I was under the impression that in order to have a good ground you should have it connected to the battery.

heres a couple of pics to help out a bit.

heres a diagram of what it looks like:



actual pic of dis block