Yes, body weight can have an impact on power production both negative and positive. This will be a physics lesson.

Based on Newton's Second Law of Motion velocity or acceleration is a product of the amount of force applied to the mass of an object. The heavier the mass of the object the more force is required to accelerate the object. This would mean the heavier you are the more force production you must create. This would be the negative effect of body weight on building velocity. Where I believe body weight can support velocity is in Newton's Third Law of Motion.

His third law of motion states that for every action, there is an equal and opposite reaction. This means that the more force production we create using ground reaction forces then the more power is produce. This force production from the drive leg during triple extension would not support velocity with more body weight but the force production from the landing leg at front foot strike would support velocity with more body weight. This is because the heavier the body the more force that is hitting the ground through the landing leg at front foot strike. Based on Newton's Third Law for every action, there is an equal and opposite reaction, the reaction of that force from the more body weight would then produce more ground reaction forces at front foot strike and if the athlete is strong enough to stabilize the leg, that force or power will move up the leg into the hip and potentially create more hip rotation based on the mechanics. This means body weight could potentially increase velocity but you must have the power to move the body explosively and the mechanics to convert the power into torque and then the velocity of the ball.

That wore me out. I hope you got it!

I would not worry about body wait because when you study Newton's laws you see that force production is always the determining factor. Just focus on more force production!