Yes, different people will be different. Some people will just go right into their proper setup and move and for others it will look like they are fishing around a bit before it locks into place. But keep in mind that they are finding a consistent position based on their own particular geometry. It's not random
Just remember that the shoulders and hips should always rise together until you reach the lockout point and then it's a hip thrust and a butt-pinch, like you said.