Problem is that they cant possibly have any way of healing it. Splinting a leg is miles apart from treating back damage. If they were actual doctors and had equipment useable to treat him, that's one thing (would still take months if not years for him to be back at 100, but alas). They've got sticks. You cant scarecrow him and put a stick or something in his coat to make him stand. He'd need some kind of specialised rigging of some sort.
And....well, even if they were to come up with some odd way to keep him up, at best he'd move very sluggishly and with great exhaustion and pain.
What I'm getting at is he'd deliver a very underwhelming effort, fight-wise.
I stand firm by my wish for him to just be left behind like a wounded animal. Nothing would give of the same kind of ''fuck you'' ironic vibe for such an ''animal'' of a man. No big sendoff. Just him crying out for help as he's left behind.
It's also make more sense knowing most (all, really) TWD villains dont go out with a *BANG*. Governor died pathetically, the Hunters as well, and then we got Spencer...Gregory....Rose Family...and even Alpha. TWD isnt the type of show where bad people go out admirably or cool.
Instead they all die realizing either how little they really could control, or how their own actions led them there. They die cus karma demands it.
At best I'd want a face reveal before it, but that's about it.