Current flow.

There is a very useful article on this topic in Wikipedia.

That link only goes to the main wikipedia site. What are you searching under?

Wikipedia:
http://en.wikipedia.org/wiki/Three-phase_electric_power
http://en.wikipedia.org/wiki/Three-phase

Both are useful to discovering 3-phase power and how it works.

when u consider the 3-phase wave form diagram, the red phase is at 90 degrees, white phase at 0 degrees and blue at 180 degrees, at this point the white phase serve as the the return current line. before the phases complete 360 degrees, there will be a point where each phase will be at 0 degree, at this point, the particular phase which is at 0 degree serves as the current return line.

Not true in any way shape or form. You may want to think about reading up on the nature of a three phase system again.