First of all, TMI.
Secondly, I think we all understand how being overweight limits mobility. And we understand how it will become worse as Pablo ages. However, he has always been at least average as a defender until last year, while being fat. Maybe, just maybe, he can bounce back.
Thirdly, how do you know that he doesn't have some real mental, emotional, or physical issues (similar to yours) that are keeping him from being able to lose weight and keep it off? Honestly, I doubt that that's the case, but we don't know that.