Mercedes is obvious that it is very good on low fuel, qualifying and one lap sprint pace.
You can tell in the beginning fuel fuel load and used tires, it is a dog. But near toward the last 10 laps, the car comes alive. This will put them in the back foot.
McLaren is the direct opposite, its lack of pace was hidden and camouflaged with the heavy fuel and new tires. In addition to other's disadvantage, makes them look more competitive than they actually were.