It is possible that there could be a split pot, although unlikely, so by folding, you should have guaranteed yourself at least 2nd place.
Your stack size disadvantage would be enormous though and you would likely find yourself being put all in in every HU hand.
To attempt to answer your question I'm fairly sure that each poker site
has rules which govern this situation and I have no doubt that they all differ slightly. If I were writing the rules all of the other 5 players would split the 2nd place cash but I'm fairly sure that that is too simplistic a solution.