Getting old, getting ill, sucks. I wouldn't put any blame at his feet as he is clearly trying to deal with something and in his line of work it's an Everest of a climb. Having spent time with stroke patients it really seems like he is trying to recover from a minor one and relearning to process and speak.
As it stands, I have a very hard time believing that he will remain in the booth this year as that pre-season game was painful to listen to despite rooting for the guy.
Unless Brick picks up all the PBP commentary leaving spaces for Jack to callout hits and goals it just doesn't work. Even then it may turn out to be a downer because he is / needs to be so deliberate with his calls and it takes the emotion out of it as it isn't contemperous with the action anymore.
Hate to say it but he needs to hang them up and hopefully if the front office and NESN really are trying to do him a favour they collectively find a way for him to contribute during this season either in PR, event or other activities and get's someone in the booth that can call the game at pace and with some emotion.
It's super unfortunate and to use an analogy, it's like a lifetime soldier who fought battles and wars, ended up getting severely injured and partially paralyzed. You don't throw them back out there in the trenches just because they say they can still fight. You respect the past and help into the future by trying to find the appropriate manner in which that soldier can still contribute to the cause and help them to understand the importance of making that adjustment. And get them into PT and support them to try and walk again, just not in the trenches getting shot at...
If this is some type of "win it for the beaver" approach by NESN / B's front office, then they would be MUCH BETTER OFF calling it as that and stating that he got sick / ill / etc and they decided that they wanted to show that people with that issue / disability can still make it. Put that foot forward and I think a lot of people would be able to accept and back it. Obviously that means they are wed to the decision as they can't backtrack or side step (like with Miller) this year but man would it be good to see some spine from the FO on taking a moral + business decision.
The ignoring the elephant thing won't work and the more they let it go on, the more they look like assholes when/if they can him for a probable medical condition.
Time to call it NESN/B's.