FST Frank?

Does anybody think it's significant that other than MiB and Richard, Frank is the only current main character we haven't seen in the flash-sideways? We've even gotten the random tarot card reader from ep 310 and Frogurt in the sideways, but still no Lapidus 13 episodes in. He could have easily been the pilot of 815 in the FST, they had Desmond on the plane when he wasn't supposed to be and Shannon off it when she wasn't supposed to be.

So does anyone think he'll be significant in the FST or that it's significant that we still haven't seen him?

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