So to be recap, a disabled person might be receiving care and benefits to the value of £100s a week. All of which is simply intended to bring them up to the starting point a fit person takes for granted. (Often it can't - amount isn't enough, or no money could change some things.)
Separate from that, disabled people need income like everyone else.
Some may work.
Some may be supported by spouses.
Some may be officially unable to work and get ESA.
Some may be officially unable to work and NOT get ESA.
Some may be nominally able to work but employers consider them unemployable due to sickness absences.
And so on.
You can see that some groups are pretty screwed.
The introduction of mandatory work (or work-related activity) for people officially too sick to work has been particularly damaging. People are becoming sick and/or being sanctioned, trying and failing to meet the demands.