Prior to the events of the season 3 finale of Fringe, the Broyles from Over There (i.e. Col. Broyles) died. After the events of that finale, a character was wiped from history. Col. Broyles was killed and used as the mass sent Over Here to replace the Olivia from Over There (i.e. Fauxlivia) when they brought her back Over There.
It seemed like his death was a key part of the events of the escalating conflict between the two Earths. But in S4E2, One Night in October, we see Col. Broyles alive and well. We also know Fauxlivia still went on her mission Over Here, thanks to Walter saying as much. So is Col. Broyles still alive, and if so how? We know that the now-missing character's disappearance altered the history we've seen over the past 3 seasons, how did the events around Broyles' death change in this new history?