thing is he aint just big boned

he is visually heavily overwieght, regardless of what BMI tables say (but i agree BMI tables probably need to be updated as humans evolve).
Over BMI 40 its called "morbid" obesity for a reason. Theres valid health reasons for him being banned temporarily on health grounds. those health concerns are a by product of being so overwieght not the sheer fact he is overweight.
TBH this is going to happen more and more in various aspects of social care and education over the coming years and thats because the government is so aggressively committed to beating the obesity epidemic this country has.
Lets be honest, heavily obese parents arent setting the right example to kids. Im not convinced they have the knowledge to provide a healthy balance of diet and exercise for thier adopted child, otherwise they wouldnt be obese now. sure if they change thier lifestyle then thats a different matter.
Quite frankly its a problem the government needs to be pushing onto parents for setting the example just like the government should be pushing discipline as a parenting issue rather than something parents can disregard and assume schools will sort out.
I suspect politics will fuck it up in some way and youll have teachers suspended for being too fat etc