I don't think Ben ended up in the same place as John did. I might be mistaken but I didn't think that was the case.
We saw Locke walk up to the cot Ben was resting on and said that "this was the man that killed me."
^Okay.
And yeah, I just rewatched it. Two things to note:
1. When Widmore and Locke are talking for the first time, Widmore is suprised to hear that Ben left the island before Locke. With Widmore having that camera and all, shouldn't he have known this? I've been trying to calculate the time differences, but even if it was three years before, Widmore would have had his entire life to set this camera up. Doesn't make much sense.
We saw Ben appear in Tunisia awhile back when he moved the island. There were no cameras around at the time.