Hello Flying Dutchman. No offense to you and your friend, but I'd appreciate if you can kindly take my word of advise...

I wouldn't recommend skipping the first segment. Why? Well, urh, it's against the
contract (i.e. general flight ticket rules), and if the carrier recognizes it as fraud,
they reserve "the right to refuse carriage to any person who has acquired a
ticket in violation of applicable law or carrier's tariffs, rules or regulations."
Deliberately or not, throwing away flight coupons and not using it in the correct
sequence is not one of those "gray zone" tricks, it's black.

If for some reason your friend successfully starts the RTW from the second
segment, and at some point is noticed by the carrier, the chances are he/she will
be subject to compensation for full fare - and you know this is very very
expensive.

I'm really sorry if I sound quite sour, but nobody wants to hear horror stories like
someone had to pay USD3,000 at the airport to continue the journey just
because he/she didn't know the rules... I personally know these tragedies, and it
is really ugly. The particular case I know was not by ignorance but by intentions
to cheat, but that person had to give up the rest of his flight coupons, was forced
to purchase a new set of full fare tickets and went on black list.