Abdelhamid Abaaoud was confirmed dead on Thursday, a day after he was killed in a police raid on a safe house in the suburb of Saint-Denis.
Abaaoud is considered to have ordered and meticulously planned the attacks, as well as several other foiled terror plots in Paris this year.
Until this week authorities were under the impression he was in Syria.
On Friday various reports in the French media claimed that police had spotted Abaaoud jumping over the barriers of the Metro station at Croix de Chavaux, in Montreuil.
The station, near the end of Line 9, is located just 200 metres from from where a Black Seat car was found, that had been used in the attacks on the cafe and bar terraces across eastern Paris.
Inside the car police found an arsenal of weapons including several kalashnikovs.
Up until now Abaaoud had just been considered the ringleader and organiser of the attacks but his presence in Montreuil at 22.14, after dozens had been slaughtered, suggests he may have been part of the team that carried out the shootings.
Police believe the brothers Salah and Brahim Abdelsam are believed to have been behind the terrace shootings, but a third man was spotted in the car in a video seen by investigators.
Salah is still on the run and was apparently spotted in Anderlecht, Belgium on Thursday night. Brahim blew himself up the Comptoir Voltaire brasserie shortly after the shootings.
It is not clear where Abaaoud travelled to after being seen jumping over the barriers at Croix de Chavaux.