The final season of Lost features 15 series regulars, and thanks to the arrival of Ilana Verdansky as Desmond's lawyer and the executor of Christian Shephard's estate, almost all of them have shown up in the flash-sideways. Obviously Richard Alpert isn't there because, more likely than not, he died with the Island.
But other than him, the only person we haven't seen is Frank Lapidus. To say the Ajira pilot is being underused on Lost is an understatement. Since crashing on the Island with the rest of Ajira 316, Lapidus has been a glorified extra, walking around with the survivors and occasionally adding a clever quip or two.
As far as I can tell, there are only two possible explanations. The first is that the writers have no clue what to do with him, but they can't kill him off because they centered a story arc around flying off the Island, so they need a pilot. The second theory is that they're saving him for something big.
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