If you look at Avatar and the character of Quaritch the right way. Some see certain parallels between him and the messianic archetype, especially the one of Jesus (I personally don't believe in that kind of stuff). This is mostly for fun, and to point out that Quaritch can be a messianic character as well.
For one he offered a crippled man the means to walk again (healing the ill), he righteously stuck down those who are in the way of mankind's prosperity (I am playing devil's advocate slightly), he fought against a foreign god who is many and who unleashed its minions on man (I am Legion for we are many), he died for mankind or for a higher cause (debatable, but I think he actually saw unobtanium as important to mankind), and he was struck down by the actions of a traitor (remind you of anything? Also I am only pointing out that Jake is a traitor and not asessing the morality of his actions), and finally he came down from the sky aflame in one scene (think about that for a second).
So if you place all of the pieces together than you get the conclusion that Quaritch may be a messiah-type character and thus logically he would have to return.

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