Jack, who doesn't know what to make of that, points out that Locke was the only one who ever believed in the island; Locke was the only one who wanted them to stay. Faucke: "John Locke was not a believer, Jack. He was a sucker." I hate to speak ill of the dead, but Locke's alive someplace, right, so I'll just point you here, here, here, here, and here and let you make up your own minds.
Sideways: Prof. Benjamin Linus rides along in the ambulance that's rushing substitute teacher John Locke to the hospital, after his encounter with Desmond Ex Machina. Ben gives the EMTs what little he knows about Locke (paralysis), which is so little, it doesn't even include his first name, never mind contact information. During the course of conversation, the EMT says that Locke's wheelchair probably saved his life. Huh. He also says it was destroyed, which... wasn't it standing in the parking lot? Whatever. Finally, Locke mumbles Helen's name. "Helen Norwood. I was -- gonna marry her." Was gonna? Looks like someone's had his other life flash before his eyes. Ben doesn't realize the significance, so he just says, "You're still going to marry her because you're going to be okay, Mr. Locke." Locke: "John. My name is John." Assuming Locke has now seen the future, can you imagine what he must be thinking as he watches his own killer care for him?
At St. Sebastian's (the only hospital in Sideways L.A.) Sun and Locke's stretchers are wheeled in side by side. Now, some fans are calling this a continuity error (because Sun was wounded long before Des mowed down Locke), but I think it's more proof that the Island reality is bleeding into the sideways, and vice versa. When something significant happens in one reality (one of those "whatever happened happens" happenings), it affects the other reality.