A very long conservation project

According to The New York Times article, “As One Renaissance Door Closes, Others Open” (by Elisabetta Povoledo, February 23, 2013), thirty years after it was begun the conservation of the rooms in the second floor apartment of the Pontifical Palace (Vatican City) decorated by Raphael has been completed. Many insights into Raphael’s working methods in fresco have come out of the project. Only Professor Arnold Nesselrath of the Vatican Museums was able to stay with the project for the duration. If more members of the original team had been part of the project for all thirty years would long term dedication and study have produced even more insights? Or, was it new team members bringing new outlooks and approaches which led to the important discoveries?