Woz --> To piggyback a little on Henry Ford's take: The other thing that might stretch out your damages is time. If the doctor can tell you that the brain damage is indefinite (and my somewhat limited experience with nerve damage tells me that often they can't tell you whether it'll be short-term, long-term, or forever) then you get to argue not just the severity of the injury, but the potential duration. Not only can he not smell or taste, but he may never be able to do so again. He used to enjoy wine tasting, cooking, craft beer making etc., and now he can't. Etc etc etc.
I really feel like pushing the smell and taste can be secondary to all the other brain damage that's likely to begin to show as he deteriorates. Olfactory nerve is on the bottom. He's extremely likely to have at least some lesions in the frontal, parietal, and/or temporal lobes, and
just like his olfactory nerve has deteriorated quickly, the other areas will, slowly. Language. Executive function. Logic. Memory. Basic intelligence. If the neurologist issues a "more likely than not" opinion on deterioration based on the MRI, this case jumps in value substantially.
This is just the tip of the iceberg can be a huge argument.