I appreciate you taking the time to reply and clarify things but I would like to say I have a pretty good understanding of ADHD. As I have mentioned my son was diagnosed with ADHD a couple of years ago. I go with him to every appointment and support groups we are in. I have spent dozens of hours with his doctor, psychologists, etc. to try and learn as much as possible about ADHD to support him as best I can and to ensure I can get the support he needs in school.
My comment about the other family member not being able to concentrate on a crossword was more a summation of the issue not a specific example. He has always been an intelligent guy, he wasn't gifted nor did he need to push himself extra hard to succeed. He never had issues concentrating on "boring" tasks for all the time I have known him (30+ years at this point). Sure he was never super engaged with them (who would be?) but he didn't get lost in procrastination.
What I mean is these are all very new things for him. Even for things he used to love such as games he cannot find the "mental energy" (as he puts it) to play. To begin with I put this down to his injury and while his hand will never be as good as it was he can use it "fine" for such things now. He just has no interest. No interest in anything. Basically all he wants to do is just sit on the computer and mindlessly consume. He stopped coding, stopped playing games, stopped reading, not taking his drone out, stopped doing some 3D stuff in Blender, stopped watching the kind of shows he used to love, etc. Pretty much the only thing he does still do that he did before is go to gigs. And perhaps this is unfair of me but I suspect that is because he always takes some drugs while there.
What I mean is he had a large change in personality over the past two years since the attack, not just his executive functioning.
Now it is very possible he always had ADHD but like many he managed to cope with it via systems he developed and perhaps the attack (or the pandemic) caused those systems to fail him and maybe just medication will help him. My worry is that he has some other issues and for one reason or another he convinced himself it is ADHD and only ADHD.
This is a concern his wife also shares and we have discussed. When she has suggested therapy he dismisses it as "not something that works for him" (even though he has never actually had any to validate that claim). It is a tricky subject and he is now sure he is "fixed" as his concentration is indeed better as he is taking some kind of amphetamine 4 times a day, however his wife has told me there is no improvement in any other areas which she is worried will lead to a crash at some point.