Ridiculously wrong in every aspect. Why don't you put on a 12-pound jacket and see how it affects your ability to walk, run, jump, agility, speed, and endurance? Sheesh.
Weight obviously has a big impact on someone, but this is just a terrible analogy unless you plan on literally putting on 12 pounds at once when you gain weight (which doesn't happen). Your body gets used to these things over time because you carry yourself everywhere everyday, and putting on weight is more gradual than putting on a 12 pound jacket within 5 seconds. I'm not saying that putting on weight doesn't have an impact - of course it does, it has a big impact and it's stupid to think otherwise, but the analogy was just bad. Putting on 12 pounds over a month or two is a lot different than putting on a 12 pound jacket in 5 seconds and trying to all of a sudden run and jump with it.
Anyway, as someone like Georges who works out, losing weight is obviously a very good thing as long as he keeps working out and eating right (which he will). I'll expect him to actually be able to jump a little bit now