The trouble is that when the benefits and disability payments are in the young person's name it looks like the carer is poncing off them, but they're not.
The financial breakdown is probably about like this (excluding all housing costs)
Young person - uc with lcwra and pip £1350
Carer - uc and carer's allowance £700
Something like that and no or very little earned income.
From that combined pot comes utilities, transport, food, clothing, entertainment, pets, insurances for both members of the household.
We all know that it would be exceptionally difficult to run a house on £700pm, nothing but porridge and lentils and food banks.
So, how much 'pocket money' or unassigned money does the young person get to keep when 100% of the carer's money is going in the pot?
I'd be willing to bet the young person is more expensive to feed than the carer and perhaps has allergies and needs a particular soap, shampoo, laundry detergent.
If the young, disabled, person moves out obviously they take their benefits with them and the carer is free to work and have a lodger. If they're not at the knackers yard being boiled down for glue.