I agree that certain players may perform better after a coaching change, but you have to keep in mind that if we wait to see how players respond to a new coach, we're not making any major moves until January 2025. They are very clearly not changing coaches in season so we'd have to wait until half way through next season.
In terms of Batherson, I think that he is a player who we will move, and it will become a meme. As in, he will break out as a 100+ point forward. He has that kind of potential, but I also think he needs a change of scenery to get there. He needs a fresh start, and he needs to go to a team offensively where there is an opening for him to be one of the #1 wingers.
I don't want to see the Senators trade him, but if they get back a #2 RHD, I would more than understand. They need to do something to change the complexion of the team, and Batherson is the most logical of the core forwards to move once you figure they aren't moving Giroux, Stutzle, or Tkachuk, Norris has ties to Tkachuk and plays center. So if they think they need to shake up the group, Batherson is the guy.
As far as Kubalik or Brannstrom, I doubt they have much value. Even if we move them or don't re-sign them, their cap will be used next year on replacements in the top 9/top 6. So while it gives the Senators cap flexibility to move on from them, I don't think it frees up much cap in theory since the players would need to be replaced and we may not have ELC bodies to do it.