I agree, nerve damage is an imponderable, but a week is no time at all.
When my Mum went off her legs last year, the surgeon said he simply couldn't predict whether she'd get any recovery or not; his operation would prevent further deterioration is all he could guarantee. She may get no or very little improvement, or may get back as much as 75-80%, but it would be over a period of months if it happened.
That was May. By July she could stand with a frame, August walk a few steps. November/December she had a month as an in-patient at Stoke Mandeville spinal injuries unit. She threw away the ramps when she got home and hasn't used a wheelchair since. She walked into her wonderful surgeon's office (using sticks) to be greeted by an open-mouthed "Wow!" Not a dry eye in the house.
Now she never uses the sticks at home, just if she's doing a long walk.
Ingredients to her recovery included determination like you wouldn't believe, and support and belief from the family.
So, if the ram is comfortable propped up, eating and drinking, and you can stand him up to poo and pee and massage /move his legs, I'd give him a while longer.
We had a ewe went off her legs, we made a bed for her on a mattress of straw on a gate across bales, so she was supported under her belly and brisket but her legs hung down through the bars to touch the ground. We'd go and make walking movements with her legs two or three times a day, and check she wasn't getting sores and so on, and she did make a full recovery.