in my growing career i have learned that plants are like people. if you get 20 people in a room, 9 times outta 10 your gonna have 20 different looking people. In a grow you can treat every plant exactly the same but one may come out really tall, another really short, just like people. I wouldn't worry about it much. If your growing for yourself and you have the time and room you can nurse the plant or if you dont have much room and say your a dispensary grower, you'd probably get rid of the underdeveloped plants quickly, making room for the strong.