my guess on the whole "list" ordeal is that the agency or whatever power Bennet is working for/with, has had ways of locating special people for a while now (at least as far back as 92), but it seems that even before that, Chandra had developed an even more accurate way to pinpoint these people, maybe he wasn't aware of just how much more advanced he was on his research because Dr Suresh had obviously not had any contact with anyone else with similar research interests as him
seems that now, after realizing just what a big mistake it was to not cooperate totally with Chandra, Bennet might want to seek out Mohinder's aid in order to prevent more bloodshed, like the one caused by Sylar, considering this just the tip of the iceberg, imagine all the threats these people might have to deal with, I mean, NY will explode in 3 weeks