The Losties (Partly) Came From The Sideways... by The Scribe

Something that the Sideways universe seems to be heading towards is that, in it, the Losties' lives are much better... but... the other thing that I noticed... their lives/health all seem to be heading towards how they are on-island.

Sun... she was pregnant in the Sideways, yet "regular" Jin, before the Island, was infertile;

Locke... the Sideways seems to be heading towards that Jack will fix his back and he'll be able to walk...;

Mikhail... got shot in the eye;

Sawyer... became a cop;

Rose... in the Sideways, I believe that we will see her cancer regress - unless this is left as something for us to assume.

So... rather than the Sideways universe showing us the Losties' futures, what if it's actually showing us their "make-up" in some way..? What if Jacob was able to not just bring the regular time-line Losties to the island but was actually able to pull them together from bits and pieces across the two (or more) alt-universes...? So, he'd bring Locke's memories and so on across from the main timeline and Locke's (fixed) body from the Sideways, creating the Locke that we know on-island.

Pros:-
It would explain a lot of the strangeness and unexplained things that we've seen - solving a whole load of mysteries in one go.

Cons:-
If the Losties really are made up from bits from different Alts then... what's going to be "the end"? How can a happy ending come out of this when, already, a lot of the on-island Losties have died? Does the story end with one or more of the Alts..?