The actual explanation is much simpler, though--time is moving at roughly the same rate on the island even after it was moved, and it was Locke who made a big time jump, as Ben did, when he turned the wheel. Ben turned the wheel just a few days before Locke and ended up less than a year in the future (2005); a few days later, Locke turned the wheel and was in 2007. The effects were said to be unpredictable, and there you go.
However, I would be personally disappointed if every action could be traced to the Lostaways. If they are the cause of the Incident and the Purge and the recording of the numbers and the pregnancy problems and the…that would be a little too much, and it would take away from the fun when they are involved.
A couple things to ponder. When they are discussing looking for Jack, Locke tells Kate and Sayid that he “knows where to look”. Interesting.
The big line in the Jack/Locke scene that everyone remembers is “I’ve looked into the eye of this island, and what I saw was beautiful.” Knowing that was coming, though, I was more amused by Locke telling Jack he’s not going crazy, because crazy people think they’re getting saner (and Jack has raised the possibility that he’s going crazy). Locke spends most of the next four season thinking he’s getting saner as he gets more and more crazy.
Another point is that in an interview about his character (Locke), Terry O’Quinn apparently floated the theory that the island is malevolent. This is something I’ve mentioned before; Locke and his fans always talk about him doing what’s in the best interest of the island. But using that as a justification for actions takes for granted that the desires of the island are good. I think we’ve seen more than enough to throw out some challenge flags at that assertion.