I did the same cable relocation with my TCS many years ago but I've forgotten the reason. At the time I was chasing down an intermittent starter issue where the starter solenoid would click without turning the starter motor over. I remember the positive cable being in fairly bad shape with a lot of corrosion on the lug and in the strands. In replacing the cable I decided to run the cable similar to what the red TC owner had done. I don't recall if it was due to just being lazy or to keep the cable away from the header. Anyway, the new cable did not solve the starting issue if I recall correctly. I found a picture showing the battery cable (at the time, black was the only color I could find) after pulling my engine.
