Soldato
Call it what you like. They're not setting lap times as fast as they could. So I don't think it's likely that Mercedes is a dog.The most they could sandbag (be off the pace) and still be 'on it' (so to speak) is about 4-5 seconds according to what I heard on the commentary. i.e. full fuel load and engine turned down, but driver still pushing.
It doesn't look like that is the case though, they are just methodically going through their program.