It's already been well noted about Lemaitre's upside.As evidence look at the video of yesterday's final.Admittedly an absolutely lightning quick reaction to the gun,but notice the line down the lane.He's slightly off-balanced to his left(not absolutely detrimental but can add fractions to a sprint),and then bows to the right side of the lane even so much as to be hugging the line on the right at the finish line...far from the perfect straight line we pine for. Even more importantly notice the huge spinal undulation this could be cleaned up tremendously,I'm not saying I like a michael johnson-like posture;for most that too far extreme in the other direction,but a little more ergonomic upper body form would be devastating in time improvement.Add in minimal wind-aid,the competition not being way over his head(at this time),and the wearing down of heat-work...this young man is easily with-in striking distance of top-of-worldclass in the not that distant future...he could easily been our first sub-ten today.