There was a day when Babe Ruth was unproven. Michael Jordan, Phil Jackson, Tiger Woods, Bill Belichick, Tony La Russa. Only time will tell.
Although let's say the Twins managed to snag some guy who was heralded as the best manager of all time. This guy unfortunately can't go out and pitch a quality start 6 or 7 times a week. I believe to have a great sports team you need the right mix of good coaching and talented players. Time will tell with Moli but we are all well aware of the current "talented player" situation on the pitching staff. Point being, I wouldn't expect a 90-72 season until the Twins have a starting rotation that is respectable. If The Twins go 81-81 I would be extremely sold on Molitor.