Suri, your comment can be interpreted in more ways than one. You could be implying that they were targeted for elimination on at some early stage of the trip. I am guessing that Zolo was planted in the group in this theory. You could also be suggesting that like a Greek tragedy, there was no choice in their situation and like billiard balls struck by a cue, they were each set on a trajectory which had but one outcome.
I propose that even if free will turns out to be an illusion, we know that hard choices can be defined as several types. It is easy to choose between two good outcomes. It is more a matter of conscience and self control when choosing immediate gratification and knowing a price will be paid later. Finally, there is the situation where a choice has to be made between two unsavory options.
I can imagine the hikers put in any of these situations. It makes me wonder whether Igor led by consent or not. Put another way, when dealing with their dilemmas, did they decide as a group( consentual) or was it top down decision making?
Naturally, there are those on the forum who would argue that none of it mattered because it was assassins, not weather that sealed their fate.